Friday, 19 September 2014

Puckerings archive: Point Allocation (09 Apr 2002)

What follows is a post from my old hockey analysis site puckerings.com (later hockeythink.com). It is reproduced here for posterity; bear in mind this writing is over a decade old and I may not even agree with it myself anymore. This post was originally published on April 9, 2002.
 

Point Allocation
Copyright Iain Fyffe, 2002


For those who may not know, Bill James is quite a brilliant man. He's known primarily, of course, for his work as a stathead in baseball. It has become fashionable of late (especially amongst younger statheads) to decry James' work. I'll not get into that; I'll just say this: his pure writing about baseball is arguably more impressive and engaging than his statistical work about baseball. Even if he wasn't a brilliant statistician, his work would still be invaluable to any fan who considers himself to be knowledgable about the game.

Fortunately for us hockey folk, some of James' work and ideas can be translated for use in hockey, or can at least be used for inspiration. This paper describes the development of the Point Allocation system, which is a method of evaluating players based on their contributions to their team's success (or lack thereof). It is based on two bits of Bill James; I have adapted his Marginal Runs analysis, which forms the basis for his Win Shares system of player evaluation, and I have extrapolated quite a bit from a fairly casual remark he made in The Politics of Glory.

I'll start with that relatively innocuous comment. James was discussing the common assertion that defence is not reflected well in statistics (at least, the statistics that most people talk about). He pointed out that, to a degree, defence is in fact reflected, through the length of the player's career, and the amount that he plays. For instance, Brooks Robinson was not a particularly great hitter. And yet, he had an exceptionally long career. Why? You know the answer: he was probably the greatest defensive third baseman who ever lived.

Epiphany! Look at this: Guy Carbonneau and Bob Gainey (for example), both with unimpressive offensive totals, both with long careers. Both renowned as defensive players, even if the stats (like plus-minus) "don't show it".

Epiphany again! Maybe we can take this concept down to a team-season level. That is, say we have two players on the same team, who contribute the same offensively, on a per-minute basis. One player plays 15 minutes per game, the other plays 18 minutes per game. Since these players are offensive equals, there can be only one explanation for the discrepancy in playing time: defence. That second player's defence must be sufficiently better than the first's to warrant three extra minutes of playing time per game. More on this later. 

Marginal Goals

Now we move on to the basic ideas behind James' Win Shares system, which I have adapted to create the Point Allocation system. Win Shares is a way of distributing a team's wins amongst its players, based on their relative contributions to the team's success. The building block of Win Shares is Marginal Runs; therefore the building block for Point Allocation is Marginal Goals.
James discovered a new method that predicts team success similarly to his famous Pythagorean analysis (which itself has been adapted to hockey by Marc Foster). I'll explain it in hockey terms. The following formula is an excellent predictor of a team's winning percentage:

E(Pct) = (MGF + MGS) / (2 x AvgG)

Where E(Pct) is expected winning percentage; MGF is Marginal Goals For, calculated as the team's goals for less one-half the league-average goals per team; MGS is Marginal Goals Saved, calculated as one and one-half times the league- average goals per team less the team's goals against; and AvgG is the league-average goals per team.

Marginal Goals is no better at predicting winning percentage than Pythagorean analysis; in fact, it's probably slightly worse. However, what Marginal Goals allows us to do is apportion the team's winning percentage (in the form of points) between a team's offence and defence, as follows:

OP = MGF / TMG x Pts
DP = MGS / TMG x Pts

Where OP is offensive points (points attributable to offence); DP is defensive points (points attributable to defence); TMG is Total Marginal Goals (Marginal Goals For plus Marginal Goals Saved); Pts is the team's points (ties plus two times wins); and MGF and MGS are defined as above.

We simply cannot do this with Pythagorean analysis. Say we have two .500 teams in a league where 300 goals is average. Team A scores and allows 350 goals, while Team B scores and allows 250. Pythagorean analysis will tell us that both of these teams should both be at .500, which they are. But Team A's success is clearly tied to its offence, while Team B relies more on defence. Marginal Goal analysis allows us to determine how much success is attributable to offence and defence (in this example, Team A is 67% offence and 33% defence, and Team B is 33% offence and 67% defence).

Now if you're wondering why 0.5 and 1.5 are used, rather than some other numbers, it is because these produce a result where approximately one-half of all points will be attributed to offence, and one-half to defence. I know this to be true, as I have tested it; I just haven't proven it mathematically.

From here we depart from Mr. James' work. The next step is to allocate the OP and DP amongst the team's players, and the methods used in baseball's Win Shares are not transferable to hockey. So I have devised my own methods of doing so. As an illustrative example, I will go through the Point Allocation calculations for the 2000/01 Detroit Red Wings.

Team Analysis

The Red Wings played 82 games, collecting 107 points (note that I have eliminated points for OT losses, to keep consistency with the entire history of the NHL). In a league in which 226 goals was average, they scored 253 goals and allowed 202 goals. Therefore, their MGF was 140, and their MGS was 137, for a TMG of 277. Thus their 107 points are allocated as follows: 54.1 to offence, and 52.9 to defence.

Offence

Fortunately, hockey stats reflect offensive contribution quite well, through goals and assists. We cannot use scoring points, however, because of the arbitrary way in which they combine goals and assists. There is no reason to think that playmaking is 1.7 times as important as goalscoring (which is what scoring points do in modern times, where there are about 1.7 times as many assists as goals). Since there is no way to determine the relative importance of playmaking and goalscoring, we will assume they are equally important.

Therefore, to allocate offensive points, we need to calculate a new stat, Offensive Contribution (OC), which is simply defined as the player's assists divided by the team average assists per goal, plus the player's goals. For instance, Brendan Shanahan had 31 goals and 45 assists in 2000/01, and the Wings had 1.70 assists per goal. Shanahan's OC is therefore 57 (45/1.7 + 31). Doing this for every Red Wing, we find the team total is 509 (which is twice their goals, with a rounding difference). Shanahan's OC is .112 of the team total; therefore he receives 6.1 Offensive Points (OP), which is .112 of the team's points allocated to offence. Note that in this analysis, goals and assists by goaltenders are ignored. A goaltender's value lies in stopping pucks, not in shooting the puck down the ice into an empty net. Similarly, goalie assists are more a function of team offence, and have little to do with the goalie's skill.

Defence

Defence in hockey is made up of two parts: the skaters who attempt to prevent shots, and the goaltender who attempts to stop those shots that are allowed. Therefore, before we can allocate defensive points amongst a team's players, we need to determine how many go to team defence, and how many go to goaltending.

Since we have defined a defence's job as preventing shots, and a goalie's job as stopping shots, we will use team shots against and goalie save percentage in conjunction with marginal goal analysis to allocate points.

We start with team defence. The defence is responsible for preventing shots. Therefore, we calculate the MGS you would expect for the team based on their actual shots allowed. Detroit allowed 2221 shots in 2000/01, and the NHL average scoring percentage was 9.95%. Therefore we would expect Detroit's defence to have a MGS of 118 ((226 x 1.5) - (2221 x .0995).

Now we move on the goaltending. Since a goalie's job is to stop shots, we evaluate them based on their save percentage. We calculate the MGS we would expect for the goalies based on their save percentage, and then calculate a weighted average for all the team's goaltenders, based on the goalies' playing times. Manny Legace had a .920 save percentage in 2000/01. The NHL average shots per game (excluding empty-net shots) was 2265, and the league average goals (excluding empty-netters) was 219. Legace's MGS is therefore 148 ((219 x 1.5) - (2265 x (1 - .920)). Similarly, Chris Osgood's MGS is 109 based on his .903 save percentage. Legace played 2136 minutes, and Osgood played 2834; the weighted-average MGS for Detroit's goaltending is therefore 126.

We now need to combine these two figures. There are, on average, 4.9 skaters and one goaltender on the ice at any one time. Therefore we will assume that the skaters' value is 4.9 times as important as the goaltending value. Therefore, the DP are distributed as follows:

DPS = DP x MGSS /(4.9 x MGSS + MGSG)
DPG = DP x MGSG /(4.9 x MGSS + MGSG)

Where DPS is Defensive Points allocated to skaters, DPG is Defensive Points allocated to goalies, DP is team Defensive Points, MGSS is the MGS value for skaters, and MGSG is the MGS value for goalies.

For Detroit, this works out to 9.5 for goaltenders and 43.4 for skaters.

Allocating DP to Goaltenders

Allocating the goaltending DP among the team's goaltenders is a simple task. Simply take each goaltender's contribution to the team weighted-average MGS to determine the proportion of DPG he receives. For instance, Detroit's MGSG of 126 was made up of 64 from Manny Legace (148 MGS time his proportion of minutes played) and 62 from Chris Osgood. Therefore, Legace receives 50.8% of the DPG (64/126), or 4.8 points. Osgood receives the remaining 4.7 points.

Allocating DP to Skaters

Skaters' defence is such an ephemeral quality; we all know that the stats don't reflect defence in any meaningful way. But wait! Remember what I was discussing before I got into all of this; a player's defensive value is reflected in his playing time, when his offence and his teammates are taken into consideration. Just like Bill James' breakthrough in fielding analysis, we start at the team level. It's probably easiest to explain by diving right into the illustration.

First, we must assume that a skater's job is made up of equal parts offence and defence, on average. Then we also assume that a player's total value to a team is reflected in his playing time; that is, a team's best players will play the most. I believe these are perfectly logical and safe assumptions. We then compare each player to the average offensive numbers for his position (forward and defence) to find his offensive contribution relative to the team average. Comparing this to his actual playing time, we can estimate his defensive value to the team.

Let's look at some numbers. Detroit's forwards, in total, played 14,250 minutes in 957 games, for an average of 14.89 minutes per game. They had a total OC of 386. The average OC for a Detroit forward was therefore 0.40 per 14.89 minutes.

Now let's look at Brendan Shanahan, Detroit's top scorer in terms of points. He played an average of 18.37 minutes per game, and had an OC per 14.89 minutes of 0.57. His OC was 1.425 times that of an average team forward; if playing time depended only upon offence, we would thus expect him to play 21.22 minutes per game (1.425 x 14.89). But he played only 18.37 minutes per game; 2.85 minutes per game less than the offensive expectation. This difference must be due to his defence, which is obviously not as good as his offence. His defensive minutes per game would be 18.37 minus 2.85, or 15.52; since offence and defence are equally important, this will give us his average playing time of 18.37 per game. If playing time were based solely on defence, Shanahan would probably play about 15.52 minutes per game. He played 81 games, so his total defensive minutes would be 1,257 (15.52 times 81).

We do this for each player in turn. Note that for defencemen, the values for the Red Wings defencemen must be used (9,793 minutes in 512 games, 19.13 minutes per game, 0.24 OC per 19.13 minutes). Also note that it is possible that a player's calculated defensive time would be negative (though usually only for a player playing only a few games). Since we are dealing only with marginal contributions, negative values make no sense. Therefore, any negative value is assumed to be zero in all analysis involving Marginal Goals, and throughout the Point Allocation system. Adding up the minutes, we find Detroit's team total to be 25,209 defensive minutes. We use this total to allocate defensive points to skaters, based on their proportionate contribution to the total. Shanahan had 1,257 of the team's 25,209 defensive minutes, or 0.050 of the total. He therefore receives 0.050 of the 43.4 skater defensive points, or 2.2 points. Adding these to his 6.3 offensive points, we find his total is 8.5 points.

A Final Adjustment

We want this method to be applicable across all years for which the data is available. We don't want any distortion from schedule length or roster size to affect the results. Therefore adjustments are included, to normalize the results to an 80-game schedule, and also to 15 minutes per game for forwards and 20 minutes per game for defencemen. For example, Shanahan played 81 of 82 games; we adjust this to an 80-games schedule, so we give Shanahan 79 GP. He played 18.37 minutes when the average was 14.89; we adjust this for an average of 15, so we credit him with 18.51 minutes per game. So his total minutes are now 1,462 (79 times 18.51), instead of the 1,488 minutes he actually had. We then adjust his OP and DP based upon this adjusted minutes value. These adjustments will eliminate any bias when comparing today's players to players from the days when they played 70 games per year, or when only 17 skaters were allowed to dress. Similarly, goalies' minutes are adjusted to a base of 4800.

Here are the complete team results for the 2000/01 Red Wings. GP is adjusted GP, MIN is adjusted minutes, OP is offensive points (adjusted to MIN), DP is defensive points (adjused to MIN), and TPA is Total Points Allocated (the sum of OP and DP). 

 Name  Pos  GP  MIN  OP  DP  TPA
 Lidstrom  D  80  2379  5.4  3.7  9.1
 Fedorov  F  73  1550  5.9  2.9  8.8
 Shanahan  F  79  1462  6.2  2.2  8.4
 Lapointe  F  80  1297  4.9  1.9  6.8
 Yzerman  F  53  1187  4.1  2.5  6.6
 Kozlov  F  70  1038  3.3  1.6  4.9
 Legace  G  2063  4.8  4.8
 Osgood  G  2737  4.7  4.7
 Maltby  F  70  1007  1.8  2.5  4.3
 Draper  F  73  987  2.0  2.2  4.2
 Gill  D  66  1284  0.9  3.3  4.2
 McCarty  F  70  947  2.0  2.1  4.1
 Verbeek  F  65  884  2.7  1.4  4.1
 Ward  D  71  1261  0.8  3.3  4.1
 Holmstrom  F  71  835  3.2  0.5  3.7
 Larionov  F  38  699  2.1  1.5  3.6
 Murphy  D  56  1112  1.4  1.9  3.3
 Dandenault  D  71  1194  2.1  0.9  3.0
 Duchesne  D  53  1015  1.9  1.0  2.9
 Fischer  D  54  946  0.7  2.2  2.9
 Brown  F  59  668  1.9  0.9  2.8
 Gilchrist  F  59  693  0.7  1.9  2.6
 Devereaux  F  54  550  1.0  1.1  2.1
 Chelios  D  23  549  0.2  1.7  1.9
 Butsayev  F  15  138  0.2  0.3  0.5
 Kuznetsov  D  24  237  0.2  0.3  0.5
 Williams  F  5  62  0.2  0.1  0.3
 Wallin  D  1  4  0.0  0.0  0.0

So here we have objective evidence that Nicklas Lidstrom is, in fact, Detroit's most valuable player. This surprises no one, I imagine. It is worth noting, however, based on the sampling of team calculations I have thus far made, that it is fairly rare for a defenceman to be a team's MVP (i.e., to have the highest TPA). This may seem to indicate that the system has a bias against defencemen. But I'm not sure this is true. A defenceman's job is primarily defence, and is therefore primarily passive. A defender reacts to an opponent's offense. Therefore, he has less control over his defensive contribution than an attacker has over his offensive contribution. This is reflected in the numbers, where DP tend to be flatter in distribution than OP. So while TPA indicates a team's MVP quite clearly, remember that it is not entirely fair to compare forwards and defencemen directly, since their jobs are so different.

Note how the system also provides objective evidence of the defensive prowess of the Maltby-Draper-McCarty line. Each have a DP total greater than their OP, which is fairly rare for a forward.
For comparison's sake, here are the 1975/76 Montreal Canadiens, one of the greatest teams ever iced. The ice times are estimates calculated using my method for estimating ice time.

 Name  Pos  GP  MIN  OP  DP  TPA
 Lafleur  F  80  1709  8.7  3.8  12.5
 Dryden  G  3580  11.8  11.8
 Mahovlich  F  80  1524  6.9  3.3  10.2
 Shutt  F  80  1412  5.8  3.2  9.0
 Lambert  F  80  1362  4.7  3.5  8.2
 Lapointe  D  77  2048  4.2  3.9  8.1
 Savard  D  71  1760  2.7  4.4  7.1
 Cournoyer  F  71  1097  4.8  1.7  6.5
 Risebrough  F  80  1104  3.0  2.9  5.9
 Lemaire  F  61  991  3.6  2.0  5.6
 Robinson  D  80  1574  2.3  3.1  5.4
 Awrey  D  72  1276  0.6  4.6  5.2
 Gainey  F  78  1021  2.0  3.1  5.1
 Jarvis  F  80  941  2.0  2.6  4.6
 Bouchard  D  66  1051  0.7  3.4  4.1
 Wilson  F  59  763  2.3  1.7  4.0
 Tremblay  F  71  771  1.8  1.9  3.7
 Roberts  F  74  783  1.6  2.1  3.7
 Larocque  G  1220  3.1  3.1
 Van Boxmeer  D  46  672  1.1  0.4  1.5
 Nyrop  D  19  326  0.2  1.2  1.4
 Chartraw  D  16  233  0.3  0.5  0.8
 Goldup  F  3  21  0.0  0.1  0.1
 Shanahan  F  4  25  0.0  0.1  0.1
 Andruff  F  1  10  0.0  0.0  0.0

Friday, 12 September 2014

Puckerings archive: Harmonic Points (08 Apr 2002)

What follows is a post from my old hockey analysis site puckerings.com (later hockeythink.com). It is reproduced here for posterity; bear in mind this writing is over a decade old and I may not even agree with it myself anymore. This post was originally published on April 8, 2002.


Harmonic Points
Copyright Iain Fyffe, 2002


The way it is now, assists are more important than goals in determining scoring championships. Why do I say this? Because for every goal, there are 1.7 assists awarded. Therefore, playmakers have an advantage over goal-scorers, because there are more assists for them to get a piece of. This is not fair. There is absolutely no evidence that playmaking is more important than goal-scoring in terms of scoring goals.

Total Hockey's Adjusted Scoring stats account for this somewhat, by using historic assist rates, which are lower than current rates. But it does not go far enough. Since there is no evidence to indicate which of goal-scoring and playmaking is more important, it is only fair to assume that they are equally important. Thus, when determining a "scoring champion", we should adjust the number of assists to equal the number of goals, on a league-wide basis.

More to the point, I believe we can further refine how we decide who is a "champion" scorer. For instance, say we have three players, all of whom have 80 adjusted scoring points. Player A has 25 goals and 55 assists, Player B has 40 goals and 40 assist, and Player C has 55 goals and 25 assists. I contend that Player B is the superior scorer. Why? Because he is less reliant on other players to produce goals. Player A is a playmaker; if he has no one of talent to pass to, his scoring will suffer. Player C is a goal-scorer; he needs a playmaker to maximize his value. Player B is a more complete player; he is less reliant on teammates, and is therefore a superior individual player.

I do, of course, realize that hockey is a team game, and it takes an entire team to win. But when we are assessing individual players, we should remove the effect of his teammates as much as possible. In this case, we do this with the Harmonic Points system (HP).

HP is based on the mathematical concept of the harmonic mean. The harmonic mean of two numbers is a middle number such that by whatever part of the first term the middle term exceeds the first term, the middle terms exceeds the second term by the same part of the second term. Whew! In other words, if the harmonic mean is 20% (of the lesser term) greater than the lesser term, it will be 20% (of the greater term) lower than the greater term. Still confused? Maybe a numerical example will help.

Take two numbers: 100 and 200. The harmonic mean of these numbers is 133. 133 is 33% (of 100) greater than 100, and 33% (of 200) less than 200. 

I won't keep you in suspense any longer. Here's how to compute HP (which is simply the harmonic mean of goals and assists, times two):

HP = 2 x {(2 x G x A) / (G + A)}

Where HP is Harmonic Points, G is goals, and A is assists. The formula is multiplied by two to retain the "look" of the number of points, since we're taking an average of goals and assists. A player who has an equal number of adjusted goals and adjusted assists will have HP equal to his adjusted points.

In applying HP, I have used Total Hockey's Adjusted Scoring statistics. This is to eliminate much of the bias created by a player's time and place, allowing us to compare players from different eras. In addition, I will be indicating Adjusted Games Played (games played divided by length of schedule times 82), which are not disclosed in Total Hockey, but should be.

But using the idea that playmaking and goal-scoring are equal in importance, we cannot use Adjusted Scoring stats as they are. Adjusted Assists are based on historic assist rates, which, of course, are higher than historic goal rate. So I have adjusted Adjusted Assists to use the same base figure as goals.

Here are the single-season NHL leaders in HP per 82 Adjusted Games Played (minimum 20 AGP), from 1917/18 to 2000/01. There have been 34 100-HP pace seasons in NHL history:

 Rank  Name  Club  Year  AGP  HP  Per 82
 1.  Howie Morenz  Montreal  1927/28  80  145  149
 2.  Mario Lemieux  Pittsburgh  1992/93  59  103  143
 Mario Lemieux  Pittsburgh  1995/96  70  122  143
 4.  Wayne Gretzky  Edmonton  1983/84  76  128  138
 Mario Lemieux  Pittsburgh  1988/89  78  131  138
 6.  Wayne Gretzky  Edmonton  1981/82  82  129  129
 7.  Wayne Gretzky  Edmonton  1984/85  82  127  127
 8.  Wayne Gretzky  Edmonton  1982/83  82  122  122
 Mario Lemieux  Pittsburgh  2000/01  43  64  122
 10.  Howie Morenz  Montreal  1930/31  73  108  121
 11.  Wayne Gretzky  Edmonton  1986/87  81  117  118
 12.  Phil Esposito  Boston  1970/71  82  115  115
 13.  Mario Lemieux  Pittsburgh  1987/88  79  110  114
 14.  Ralph Weiland  Boston  1929/30  82  113  113
 15.  Irvin Bailey  Toronto  1928/29  82  112  112
 Jaromir Jagr  Pittsburgh  1995/96  82  112  112
 17.  Jaromir Jagr  Pittsburgh  1998/99  81  110  111
 18.  Wayne Gretzky  Edmonton  1985/86  82  110  110
 19.  Mario Lemieux  Pittsburgh  1989/90  60  80  109
 20.  Phil Esposito  Boston  1973/74  82  108  108
 Mario Lemieux  Pittsburgh  1991/92  66  87  108
 22.  Mario Lemieux  Pittsburgh  1996/97  76  99  107
 23.  Phil Esposito  Boston  1971/72  80  103  106
 Wayne Gretzky  Los Angeles  1988/89  80  103  106
 25.  Phil Esposito  Boston  1968/69  80  102  105
 26.  Teemu Selanne  Anaheim  1998/99  75  95  104
 27.  Aurel Joliat  Montreal  1927/28  82  103  103
 28.  Ebbie Goodfellow  Detroit  1930/31  82  102  102
 Gordie Howe  Detroit  1952/53  82  102  102
 Jaromir Jagr  Pittsburgh  2000/01  81  101  102
 31.  Mario Lemieux  Pittsburgh  1993/94  22  27  101
 Eric Lindros  Philadelphia  1996/97  52  64  101
 33.  Wayne Gretzky  Los Angeles  1990/91  80  98  100
 Steve Yzerman  Detroit  1988/89  82  100  100

It's clear, by this analysis, that Mario Lemieux is the greatest offensive player in NHL history, bar none. His competition is, of course, Wayne Gretzky. Lemieux is on this list nine times to Gretzky's eight, but Lemieux also dominates the top of the list, appearing three times in the top five (to Gretzky's once), and seven times in the top 20 (to Gretzky's six). Lemieux is the only player with multiple 140-HP pace seasons (Gretzky never had one), and the only player with multiple 130-HP pace seasons (three, to Gretzky's one).

In terms of career HP per 82 AGP, there are four distinct classes of players: (1) Mario Lemieux, (2) Wayne Gretzky, (3) current stars in their prime, and (4) everyone else. Lemieux, through the 2000/01 season, has 1077 HP in 799 AGP, for a per-82 game figure of 111. No one else is even remotely close. Gretzky is second with an average of 96 (1805 HPP in 1543 AGP). Following these two are a bunch of players in the 80's, all current players in their prime: Eric Lindros, Jaromir Jagr, Teemu Selanne and Paul Kariya. Their averages will most likely drop over time to put them in the final group. The "everyone else" group is headed by Mike Bossy (75 average), Howie Morenz (73) and Phil Esposito (73). Other high averages belong to Gordie Howe, Jean Beliveau, Steve Yzerman, Joe Sakic, Marcel Dionne, and Bobby Hull.

The degree of separation between these classes of players serve to demonstrate how truly impressive Mario Lemieux's (and, to a lesser extent, Wayne Gretzky's) scoring exploits really are. These are the complete scorers, players who can carry a team's offence on their backs, all by themselves.

Friday, 5 September 2014

Puckerings archive: Does Playoff Experience Matter? (30 Oct 2001)

What follows is a post from my old hockey analysis site puckerings.com (later hockeythink.com). It is reproduced here for posterity; bear in mind this writing is over a decade old and I may not even agree with it myself anymore. This post was originally published on October 30, 2001 and was updated on April 9, 2002.
 

Does playoff experience matter?
Copyright Iain Fyffe, 2002


We all have heard that playoff experience is critical for playoff success. It's certainly been said often enough. If a team, or rather the players on a team, don't have enough playoff experience, they don't have a prayer of winning in the post-season. I believe it's time we put this idea to the test.

The assertion is this: teams with more playoff experience will be more successful in the playoffs than teams with less playoff experience. We will define success in the playoffs as the winning of playoff series, not necessarily winning the Stanley Cup. We will test the assertion through head-to-head playoff series matchups. If the assertion is true, then a team's relative playoff experience should be a good predictor of the outcome of the playoff series.

To test this assertion, I used data from the past three NHL seasons: 1998/99, 1999/00, and 2000/01. I defined a team's playoff experience as the total career playoff games played in previous years by all players who played for the team in that playoff year. I then used these total playoff experience figures as the sole factor in predicting the winner of each playoff series. That is, I predicted that the team with more total playoff experience would win each series. Here are the results of these predictions:

 Year  Series  Right  Wrong  Pct
 1998/99  15  10  5  .667
 1999/00  15  11  4  .733
 2000/01  15  9  6  .600
 Total  45  30  15  .667

There you have it. Playoff experience is a very good predictor of playoff success, being right two-thirds of the time. But not so fast; we need to go deeper than this superficial analysis. The problem with this analysis is that a player's playoff experience is not independent of the quality of his team (defined here as regular season points). That is to say, a player's playoff success depends greatly upon him playing for a good regular-season team; but don't take my word for it.
We start with two simple points: (1) good teams generally stay good from year to year, while bad teams stay bad, and (2) teams retain a majority of the same players from year to year. Before I continue, let me demonstrate that these points are true.

To demonstrate the first point, I will simply use correlation. The following are the correlation coefficients for NHL teams' regular season points between 1998/99 and 1999/00, as well as the correlation for points between 1999/00 and 2000/01.

 Years  Correlation
 1998/99-1999/00  0.67
 1999/00-2000/01  0.77

As demonstrated in the above table, last year's points are an excellent predictor of this year's points. A correlation of 0.60 or more is considered high, and the relationship is therefore very strong.

The second point is also simple to demonstrate. I selected a random sample of five teams to test the stability of their rosters. I compiled the regular season games played in 2000/01 for players on each team at the end of the year who were also on the same team at the end of the previous year (1999/00). I then compared these results to the maximum number of man-games, which is 18 skaters plus one goalie times 82 games, or 1558 man-games. Here are the results:

 Team  Games  % of Max
 Atlanta  1086  70
 Los Angeles  915  59
 New Jersey  1300  83
 Phoenix  1002  64
 Toronto  1124  72
 Average  1085  70

As you can see, the team you play for this year is most likely the team you played for last year. On average, 70% of a team's games are played by players who also played on the team at the end of the previous year.

Now that I have established these points, let's move on to this question: how good a predictor of playoff success is regular season success? I again tested playoff series for the past three years, this time using regular season points as the sole predictor of series winners. The 'neithers' in the table below are the result of teams having equal points, and therefore no winner being predicted. The results:

 Year  Series  Right  Wrong  Neither  Pct
 1998/99  15  10  4  1  .700
 1999/00  15  11  4  0  .733
 2000/00  15  9  5  1  .633
 Total  45  30  13  2  .689

As you can see, regular season success is marginally better than playoff experience at predicting playoff winners. What this really shows is that playoff experience has no apparent effect on the results of the playoff. If playoff experience were important, it would be better at predicting winners than regular season points. However, they're virtually identical as predictors. The reason for this is that playoff experience is accumulated through playing for a good team. I have shown that players generally play for the same team from year to year, that good teams are generally good from year to year, and that good teams are successful in the playoffs. Therefore, players on good teams will accumulate large totals of playoff experience not by "knowing what it takes to win in the playoffs," but by playing for a good team that will tend naturally to win more, both in the regular season and in the playoffs.

The crucial point is this: playoff experience is the result of playing for a successful regular season team. Playoff experience is simply a reflection of playing for a good team. There is absolutely no evidence that having greater playoff experience will affect the result of a playoff series. If playoff experience were important, it would be better than regular-season points in predicting playoff series winners; in fact, it's marginally worse. In reality, it's the quality of the team that matters, not the playoff experience of the players.

Friday, 29 August 2014

Puckerings archive: Search for Meaning in RTSS (22 Oct 2001)

What follows is a post from my old hockey analysis site puckerings.com (later hockeythink.com). It is reproduced here for posterity; bear in mind this writing is over a decade old and I may not even agree with it myself anymore. This post was originally published on October 22, 2001 and was updated on April 10, 2002.
 

The Search for Meaning in RTSS:Hits and Takeaways
Copyright Iain Fyffe, 2002
Many thanks to Marc Foster


In 1997-98, the NHL introduced its Real-Time Scoring System (RTSS). This computerized system allows the tracking of many new official statistics, such as ice time, blocked shots and hits. This has given a wealth of new data to perform statistical analysis with. But there is a serious question: do the new statistics really mean anything?

Ice time is obviously a meaningful stat. The amount of time a player spends on the ice is a direct comment on his value, relative to his teammates. But do stats like hits or takeaways really indicate anything, or are they just numbers? In this essay, I will show that, indeed, hits and takeaways do have value.

If a statistic is to have value, it must indicate something about a player or team. Hits and takeaways would seem to indicate how aggressive a player is, by either making physical contact with the opponent, or by pressuring him and taking the puck away. But is this good thing? The best way to answer this question is to determine if the actions represented by these stats contribute to winning. After all, the point of hockey is to win the game. If hits and takeaways contribute to winning, then they are meaningful stats.

I will examine these statistics by using correlation to team winning percentage. If the stat has a positive coefficient of correlation, we know that as the value of the stat increases, so does the team's winning percentage. The stat would therefore contribute to winning to some degree.
The raw stats of hits (H) and takeaways (TK) themselves have little value. Here are their correlations to winning percentage, as well as the correlation of the sum of hits and takeaways (H+TK):

 97/98  98/99  99/00  00/01  Average
 H  -.04  -.01  -.30  .20  -.04
 TK  n/a  .02  -.04  .19  .06
 H+TK  n/a  .01  -.25  .26  .01

So the raw numbers themselves have absolutely no relationship to winning or losing. By themselves, these stats are just numbers. Faced with this fact, we can try to develop a new stat using these raw data, to see if we can find any meaning.

My thought process for developing this new stat (called the Disciplined Aggression Proxy, or DAP, for reasons which will become apparent) was as follows. Perhaps the reason that hits and takeaways did not correlate highly with winning was because the aggressive play represented by these stats can often lead to taking penalties. Perhaps if a team were able to play in this aggressive manner while taking relatively few penalties, they would be more successful. At first, I used only hits in the formulae, not adding takeaways until it this was suggested by Marc Foster. There are two ways to represent penalties on a team level: penalty minutes (PIM) and times short handed (TSH). TSH is theoretically superior, since it represents actual short-handed situations, but as we will see, there is little difference between the two. The original DAP formulae were as follows:

Version 1: H / PIM
Version 2: H / TSH

I then tested the correlations for these formulae, with the following results:

 97/98  98/99  99/00  00/01  Average
 Version 1  .30  .26  .01  .39  .24
 Version 2  .18  .26  -.02  .47  .22

As you can see, the DAP formulae added much meaning to the stats. The correlations were now out of the range of having no meaning, into a range (.20 and thereabouts) where we cannot simply write the relationship off as a fluke. The 1999/2000 season seems to be a fluke; without it the average correlation would be higher still. To further test the validity of the DAP, I reasoned the following. A team that kills penalties well will suffer less from taking penalties. Therefore, I calculated a new index for each team, to represent both their relative aggression and their relative penalty-killing ability. To do this I took the team's DAP divided by the league DAP, and added the team's penalty-killing percentage (PK), divided by the league average PK. This number is only used as a rough test, as it has no real meaning. The results of this are as follows:

 97/98  98/99  99/00  00/01  Average
 V.1 + PK  .36  .30  .10  .43  .30
 V.2 + PK  .25  .30  .10  .47  .43

The correlations are even higher, which lends more validity to the value of the DAP. Again, note the apparent flukiness of the 1999/2000 season.

But the development of the DAP did not end there. Marc Foster suggested the inclusion of takeaways along with hits to represent aggressive play, and this change is a good one. I therefore defined two new versions of the DAP:

Version 1A: (H + TK) / PIM
Version 2A: (H + TK) / TSH

The correlations for these are as follows:

 97/98  98/99  99/00  00/01  Average
 Version 1A  n/a  .27  .03  .42  .24
 Version 2A  n/a  .26  .02  .50  .26

Note that the averages here is misleading; we should only compare them against averages for the same three-year period. These averages are .22 for Version 1 and .24 for Version 2. The improvement is small, but still there. I also ran correlations including the teams' PK, as before:

 97/98  98/99  99/00  00/01  Average
 V.1A + PK  n/a  .31  .13  .47  .30
 V.2A + PK  n/a  .30  .14  .57  .34

These are the highest correlations we've seen. The averages for Versions 1 and 2 over this period are .28 and .31 respectively.

Therefore, by transforming hits and takeaways into the Disciplined Aggression Proxy, we have found meaning in two of the NHL's new statistics. Now let's apply our new stat.

When applying the DAP to players, I recommend using Version 1A. This is because there is no player-level stat for the number of times shorthanded. The number of minor penalties taken by a player would be a fair approximation, but this data is rarely available. And since Version 1A is only marginally worse than Version 2A, there is no great loss. I will now discuss some players who have the best ranking in DAP (Version 1A) over the past two years. The new stat will shed some new light on the value of some of these players.

1. John Madden
Madden has ranked 2nd in the NHL in DAP each of the past two years. This is remarkable consistency. He is known as perhaps the best checking forward in the game, and this reputation is well-deserved.

2. Curtis Leschyshyn
Due to his pitiful offence, Leschyshyn is not given the respect he deserves. He placed 8th in DAP in 1999/2000, and 4th last year. He is truly an elite player when it comes to aggressive yet disciplined play, and he deserves much more respect than he gets.

3. Ulf Dahlen
Dahlen was 11th two years ago and 7th last year; he's another remarkably consistent performer. He gets credit as good defensive forward, but perhaps not enough.

4. Jeff Nielsen
This defenceman was 15th in 1999/2000, and 8th in 2000/01. He's basically an unknown, but hopefully not for long. His aggressive play deserves respect.

5. Steve Rucchin
He was 18th in 1999/2000, and would have placed very highly last year had he not been injured. He has significant offensive skill to complement his aggressive play.

6. Jay Pandolfo
Pandolfo led the NHL in DAP in 1999/2000, but slipped to 27th the following year. Still, that's a very good ranking, and he deserves kudos for it. With Pandolfo and Madden, the Devils have been loaded with good, aggressive, talent.

7. Sami Kapanen
Another player whose reputation is as a strong two-way forward, Kapanen ranked 13th in 1999/2000 and 16th in 2000/01. He deserves his reputation.

8. Josef Stumpel
The first surprising player on the list, Stumpel is known as a high-skill forward who often does not give his all. But he ranked 10th in DAP in 1999/2000, and 20th last year. You may not notice his aggressive play, but it's there. Don't call this guy a floater anymore.

9. Juha Lind
Lind was in the top 30 in 1999/2000, and rose to 3rd last year. His unfortunate lack of offensive skill has hurt his playing time, but he is a good grinder.

10. Sergei Berezin
Another surprise, Berezin is regarded as a skilled, soft player. But he was 6th in 1999/2000, and in the top 30 last year.

Other noteworthy players

Viktor Kozlov, Jody Hull, James Black, Andrew Cassels, Patrick Poulin, Don Sweeney, Robert Kron, Sergei Brylin, Jonas Hoglund and Mike York all deserve credit for their aggressive yet disciplined play over the last two years. Some are already known as two-way players, some are not but probably deserve to be. Also worth noting are two rookies from last year, Stephane Robidas (5th in DAP) and Brent Sopel (6th). Keep an eye on these players. They are solid contributors to their teams.

Friday, 22 August 2014

Puckerings archive: Goal-Scoring and League Talent Level (25 Sep 2001)

What follows is a post from my old hockey analysis site puckerings.com (later hockeythink.com). It is reproduced here for posterity; bear in mind this writing is over a decade old and I may not even agree with it myself anymore. This post was originally published on September 25, 2001 and was updated on April 10, 2002.


The Relationship Between Goal-Scoring and League Talent Level
Copyright Iain Fyffe, 2002


In this era of an increasingly watered-down NHL and concurrent low levels of scoring, one often wonders about the relationship between the level of scoring and the level of talent in the NHL. This subject was addressed in some detail by Klein and Reif (KR), in "The Klein and Reif Hockey Compendium". However, seeing as KR wrote their piece in 1987, it would be appropriate to re-examine their arguments using the data that we now have available, specifically the 1987-88 to 2000-01 NHL seasons.

KR's argument is this:

"Throughout the history of the game, in those periods when the talent level in a league has risen through the consolidation of franchises or the addition of a large number of skilled players, the level of goal-scoring has consistently fallen. And when the concentration of talent has been diluted by expansion or wartime service, goal-scoring has consistently risen. When rule changes are not a factor and you see the rate of goal-scoring climb, you know something bad is happening, because more goals means bad hockey." (p.15)

KR argue that unless there is a rule change to blame, if scoring has increased, then the quality of play has decreased. If scoring dropped, this means the league talent level has improved. They demonstrate this quite convincingly with their discussion of the ECHA, NHA, and NHL to 1986-87. To recap this discussion, I will examine the 56-year period from 1931-32 to 1986-87. The starting point is selected as it follows the last major rule change, the introduction of forward passing.

During this 56-year period, the change in scoring from one year to the next varied from -15% to +19%. However, for 45 of those years (80% of the years examined), the change fell between -7% and +7% inclusive. So it seems the normal variance for scoring from one year to the next is about 7%. We will thus consider any change of less than 8% from year to year to be normal variation. Therefore any change of greater than 7% is to be considered unusual and needing explanation. These are the interesting years. Let us now examine these years that do not fall within the range of normal variation, to seek possible explanations for the changes.

1932-33: -8% change from prior year
There is no apparent reason for this change. There are no major rule changes, just minor tweaks. However, since it is just slightly greater than the normal change, we can safely assume it is a fluke.

1935-36: -15% change from prior year
1936-37: +14% change from prior year
This is really only one change: the significant drop in 1935-36, which was reversed the following year by a significant increase in scoring. The drop has no easy explanation; there were no rule changes, and the makeup of the league did not change. We may have to write this one off as unexplainable.

1941-42: +18% change from prior year
1942-43: +19% change from prior year
1943-44: +13% change from prior year
1944-45: -10% change from prior year
1945-46: - 9% change from prior year
Here KR's thesis proves very true. The loss of players to wartime commitments wreaked havoc on the level of play in the NHL, and scoring skyrocketed. As players returned from war, scoring began to drop again.

1952-53: -8% change from prior year
Again, there is no apparent explanation for this change. However, the change is only 8%, so it is very close to normal.

1980-81: +9% change from prior year
Once again there is no real explanation here. The WHA had folded two seasons previous; perhaps there was some sort of delayed effect on the NHL? But again, the change is only 9%, so it may be a fluke.

It is also interesting to note anything we might expect would cause a significant change, but did not. For instance, the Great Expansion had no significant effect. This can be explained by the stagnation of the Original Six teams. There had been only six NHL teams for so long that the level of talent in the minor leagues had been building up for a long time. Therefore, the NHL could bear the addition of six new teams without diluting the overall talent level of the league.

The collapse of the WHA also had no apparent effect. This is also explainable; the NHL absorbed only four WHA teams, while all talent from the rival league was now available. Therefore, the effect washed out to some degree.

Now I will examine KR's thesis using the data from the NHL 1987-88 to 2000-01 seasons. Here is said data.

 Year  % change
 1987-88  + 1%
 1988-89  + 1%
 1989-90  - 1%
 1990-91  - 6%
 1991-92  - 3%
 1992-93  + 8%
 1993-94  -11%
 1994-95  - 8%
 1995-96  + 5%
 1996-97  - 7%
 1997-98  - 9%
 1998-99   0%
 1999-2000  + 4%
 2000-01   0%

There are four significant changes in this 14-year period: 1992-93, 1993-94, 1994-95, and 1997-98. I will examine each in turn.

1992-93: +8% change from prior year
This year two franchises were added (Ottawa and Florida), only one year after San Jose joined the NHL. KR's thesis predicts that scoring will increase in such a situation, and so it did.

1993-94: -11% change from prior year
The addition of Anaheim and Tampa this year made five expansion franchises in three years. By KR's thesis, this should have driven scoring upward. But instead it decreased significantly. Why is this? It is likely in part due to the increased number of European players in the NHL, necessitated by the expansion. From 1990-91 to 1993-94, the number of European players in the NHL grew from about 60 to over 130. However, this increase is not even enough to stock the new teams, so at best it would hold scoring steady, not decrease it. It seems KR's thesis is disproved here. However, with one addition that I will detail later, the thesis stands.

1994-95: -8% change from prior year
While my explanation for this is not literally in line with KR, it has the same spirit. This decrease in scoring is likely the result of the strike-shortened schedule. With a shorter schedule, each game was more significant, and therefore (in theory) players pushed themselves more during the season. They also did not need to worry about tiring out during an 80-plus game schedule. Therefore, the drop in scoring is produced by better hockey, and is not surprising.

1997-98: -9% change from prior year
This decrease, coupled with the previous year's 7% decrease, is likely the result of the talent level starting to catch up after the runaway expansion of the early 1990's.
Again, we should also note the things we would expect to have caused a change, but did not. Specifically, I am speaking of the four expansion teams added over three years from 1998-99 to 2000-01. Again, by KR's thesis, this should have caused a noticeable increase in league scoring. It did not; the changes over these three years are 0%, +4%, and 0%. Again, this is contrary to KR, but with the addition I propose (detailed below), it is explainable.

Adding to the thesis

KR's argument is that as the league talent level is diluted, the league scoring level will increase. This is true to a point. It seems, however, there is a limit to this rule. So long as there is an amount of appropriate talent available, dilution will cause scoring to increase. But as the two expansions of the 1990's (nine teams added in 10 years) has demonstrated, there is a breaking point.

The runaway expansion of recent years has led to the extreme dilution of the talent in the NHL. Some players in the NHL today would not have even been above-average players in the AHL in the past. There is a limit to how thin you can spread talent, before you start scraping the bottom of the major-league barrel. When you pass this limit, it begins to drive scoring down, rather than up. The reason for this is twofold.

Offence is more a function of natural skill than is defence. The players NHL teams have to resort to now have so little offensive talent that they lower the amount of offence in the league. The extension of this is a natural change in strategy. If you have a limited amount of offence on your team, it is natural to emphasize defence (think Minnesota Wild) in order to maximize your chances of winning. More teams have to rely on this sort of defensive play now than ever before, and this also results in less scoring.

Conclusion

Diluting the talent level only drives up scoring to a certain extent. Extreme dilution of talent, such as what we have seen over the past decade, actually drives down scoring. So we can add to KR's original thesis. If dilution occurs and scoring does not increase, and there are no rule changes to explain it, then you know that the well of legitimate, major-league talent has run dry.
We can only hope that the NHL realizes this, and that we do not see any further expansion for a long time.

Reference

Klein, J. and K.-E. Reif. The Klein and Reif Hockey Compendium. Toronto: McClelland and Stewart, 1987.

Thursday, 21 August 2014

Was Rugby a Significant Influence on Early Hockey?

In discussions of early hockey in Montreal, starting in the 1870s, you'll often see claims that rugby football was a significant influence on the early versions of the game. Take this article as an example, in which many comparisons are made between 1870s ice hockey and rugby. To be fair to author Adam Gopnik, not all of the comparisons he makes are of the direct kind, some are simply the similar physical natures of the two sports; however, I suspect this point is overstated when made in reference to the 1870s version of hockey, which was not as physical as the version of the game we know now. The author's application of modern impressions of hockey is indicated when he refers to  "...its combination of being the most flashily brilliant and speedy of games and at the same time the most brutal of contact sports..." Hockey in the 1870s did not feature nearly the speed that it does now; it could not, both because of the equipment used by the players, and the fact that they had to play every minute of the game, forcing the players to pace themselves.

But the idea of significant rugby influence is well-ingrained in stories about early Montreal hockey. Once again, the article above claims that "...what [James] Creighton was trying to create when he first codified the rules of hockey in 1873 was a form of rugby on ice, played according to rules inflected by lacrosse." Now, since we don't have any writing from Creighton himself on the topic, we must ask what the source of this information is. The most likely candidates are the tales told by a number of old-time Montreal hockeyists, some time after the fact.

Some of these claims are discussed here, in an article penned by E.M Orlick on the origins of ice hockey. Richard Smith claimed (in 1908, some thirty years after the alleged fact) that he had been involved with writing the first set of hockey rules, and used both field hockey and rugby as inspiration. Orlick rightly points out the problems with details in Smith's story, in that the dates do not line up and there is no evidence that Smith was actually a player in the very first recorded matches of hockey in Montreal; he showed up a few years later. Orlick then discusses the claims of William "Chick" Murray, who relayed his tale in 1936 (about 60 years after the alleged fact). Murray stated that it was his idea to pattern the rules on rugby, but to add lacrosse posts as goals. So it seems quite likely that Gopnik's impression of the origin of ice hockey rules were informed by Murray's claims. Again Orlick rightly points out the inconsistencies in Murray's story, and feels justified in rejecting it. I cannot disagree.

A later article by Orlick discusses Henry Joseph, who has a decided advantage over Smith and Murray in that we know he was a player in the first two organized ice hockey matches played in Montreal in 1875. This was written in 1943, and refers to events allegedly occurring as early as 1873, so we're now dealing with statements made 70 years after the fact. Joseph appears to be Gopnik's source that ice hockey was first played in 1873, two years before the first recorded match on March 3, 1875. It is, of course, eminently plausible that ice hockey, specifically the version played in the Victoria rink in Montreal, was played for some time before the first recorded game. Joseph goes on to say that James Creighton suggested a shinny-like game to be played on skates, noting that in Montreal at the time, shinny was played on ice, but not with skates. Finally Joseph claims that this shinny-like game had its rules patterned on rugby.

So these stories do seem to be the source of the idea that rugby was a significant influence on the first hockey matches in Montreal, perhaps enhanced by the fact that so much of early hockey was connected to McGill University, a stronghold of rugby. If the influence was so great, surely we should be able to detect it in the historical record. So let's have a look at early ice hockey and rugby, and compare their similarities to those between ice hockey and field hockey, a game that, at least superficially, seems to bear a more immediate resemblance.

RULES

As discussed at some length in my book On His Own Side of the Puck, the early Montreal hockey code was based directly on English field hockey association rules (which in turn were based on association football [soccer] rules). Here is a comparison of the offside rules from various rule sets.

1877 Montreal offside rule
Rule 2: When a player hits the ball, any one of the same side who at such moment of hitting is nearer to the opponents’ goal line is out of play, and may not touch the ball himself, or in any way whatever prevent any other player from doing so, until the ball has been played. A player must always be on his own side of the ball.

1875 Hockey Association offside rule
Rule 6: When a player hits the ball, and one of the same side who at such moment of hitting is nearer to the opponents' goal-line is out of play, and may not touch the ball himself, not in any way whatever prevent any other player from doing so, until the ball has been played, unless there are at least three of his opponents nearer their own goal-line; but no player is out of play when the ball is hit from the goal-line.

1863 Association Football offside rule
Rule 6: When a player has kicked the ball, any one of the same side who is nearer to the opponent's goal line is out of play, and may not touch the ball himself, nor in any way whatever prevent any other player from doing so, until he is in play; but no player is out of play when the ball is kicked off from behind the goal line.

1871 Rugby Football offside rules
Rule 22: Every player is on side but is put off side if he enters a scrummage from his opponents' side or being in a scrummage gets in front of the Ball, or when the ball has been kicked, touched or is being run with by any of his own side behind him (ie between himself and his own goal line).
Rule 23: Every player when offside is out of the game and shall not touch the ball in any case whatever, either in or out of touch or goal, or in any way interrupt or obstruct any player, until he is again on side.
Rule 24: A player being offside is put on side when the ball has been run five yards with or kicked by or has touched the dress or person of any player of the opposite side or when one of his own side has run in front of him.
Rule 25: When a player has the Ball none of his opponents who at the time are offside may commence or attempt to run, tackle or otherwise interrupt such player until he has run five yards.
Rule 26: Throwing back. It is lawful for any player who has the Ball to throw it back towards his own goal, or to pass it back to any player of his own side who is at the time behind him in accordance with the rules of on side.

You will note that although both ice hockey and rugby had an offside rule, they were different offside rules. Early ice hockey is sometimes called a "backwards game" in the sense that rugby is; that is, the object of play can be passed backward to teammates, but cannot move ahead (see rugby rule 26). This was not the case in hockey. The puck itself could move forward, so long as the pass recipient was not ahead of the puck at the time the pass was made. So you could pass the puck ahead of your winger, who could skate up to meet it. Indeed, in his 1899 book Hockey: Canada' Royal Winter Game, Art Farrell explained that this was the ideal method for making a pass; note that the offside rule had not changed at all by 1899.

If you go rule-by-rule, it's absolutely clear that field hockey played a much larger part in the rules of early ice hockey. I would go so far as to say that there is no reason to believe rugby had any influence at all on the rules, if you actually look at the rules. Even the sort-of-similar rules (such as offsides) are handled differently. Joseph claimed that rugby used one referee and two umpires, as we know that early ice hockey did. But the 1871 rugby rules make no mention of either, instead specifying that the team captains are the sole arbiters of infractions. However, lacrosse did use one referee and two umpires.

POSITIONS

The earliest reference to positions in early Montreal ice hockey we have is from 1876, which identified players in a match as forwards, half-backs, backs and goaltenders. Goaltenders were referred to in 1875, but this was the first time other positions were named. Some of the rugby influence claims state that rugby positions were used (except, of course, for the curious addition of a goalkeeper). Neither modern rugby (nor modern field hockey) positions bear much apparent resemblance to this set-up. However, if we do look at groups of players rather than individual positions, in rugby today players will be referred to as forwards, half-backs and backs. No goaltender, of course.

However, this does not seem to be terminology contemporary to early ice hockey. Here, for example, we see that rugby in the 1870s featured forwards, half-backs, three-quarter-backs, and full-backs. Which is still quite close to the early ice hockey setup. However, we must also consider field hockey in this equation.

Hockey: Historical and Practical is a volume on English (field) hockey, written by J. Nicholson Smith and Philip A. Robson and published in 1899. As the title suggests, it discusses both the history of field hockey, and how it was played. When detailing the positions on the field, Smith and Robson break the players into four categories: the forwards, the half-backs, the backs and the goal-keeper. These are precisely the positions that were used in 1870s hockey in Montreal. So it seems that even if rugby used such nomenclature, it was not unique to that sport. And indeed this would make field hockey a better fit, since rugby does not use a goaltender.

EQUIPMENT

It should be plainly obvious that the equipment used in early ice hockey was much more similar to that of field hockey than to rugby. Rugby has no sticks, and the ball is much too large to be used for hockey. The goal markers were much different as well. Ice hockey added skates of course, but you cannot credit that idea to rugby, clearly.

GAME PLAY

We have already noted that the difference in the offside rules produce a significant effect on the game play of these sports. In rugby, the ball could only move backward. In field hockey and ice hockey, it could move forward so long as the players involved were onside.

The objects of rugby are quite different than ice hockey. You scored goals by kicking the ball over the crossbar and between the posts, and of course you could score touch downs, which have no equivalent in ice hockey or field hockey. In terms of the object of the game, it's clearly field hockey that is more similar.

Rugby, then as now, involved scrummages (which have no equivalent in ice hockey), and allowed tackling, which ice hockey did not. You were not permitted to take hold of a hockey player and drag him down, even if he did have the puck. In rugby, players could pick up the ball and catch it out of the air before beginning a run while holding on to the ball. There was nothing like this in hockey.

So all we're left with in terms of game play is the vague sense of physicality mentioned by Gopnik. Now, I believe that the physicality in the early version of Montreal hockey can easily be overstated, if it is thought of in modern terms. In its earliest days, ice hockey certainly allowed contact, but it was not the constant body-checking we see in the game today. Indeed it could not have been, since players expending their energy on such endeavours would not have lasted the 60 minutes they were required to play each match. However, there was certainly some rough and physical play, whereas in field hockey there was a rule in place that was designed to prevent body contact (playing right to left).

If you want to see this is as a rugby influence on early ice hockey, I'm not going to stop you. Indeed many of the players involved in the early Montreal matches were rugby football players. But it seems fairly clear that it was field hockey one ice, perhaps sprinkled with a taste of rugby. The level of physicality in early ice hockey was not equal to that in rugby; it was certainly more than field hockey, but it was also certainly less than rugby.

CONCLUSION

Going through this process, I cannot see how rugby can be said to have been a significant influence on early Montreal ice hockey. There are several claims of this, however they were all made at least three decades after the fact, and are part of stories that tend to have rather large inconsistencies with history in them. In all of the ways discussed above, with one possible exception, field hockey is a clearer source of inspiration for early Montreal hockey than rugby. When you couple this with the fact that claims of rugby influence were all made well after the fact and rely solely on fallible human memory, you reach the conclusion that there is no particular reason to believe rugby played a role.

Since McGill was such a rugby stronghold, perhaps these McGillers (Smith, Murray, Joseph) just associated everything with rugby, when in fact there were other sports much closer in nature. But whatever the reason, it appears that their claims do not stand up to scrutiny.

Tuesday, 19 August 2014

Hall of Fame Standards for the Major-League Era (Part Two)

This year's new edition of the Hockey Abstract includes a lengthy chapter on the Inductinator, which is a system I devised to determine implicit standards for the Hall of Fame, trying to figure out why each Hall of Fame player was selected as such. It may not be that the best or most deserving players are inducted according to your personal standards or indeed mine, but the Inductinator proceeds with the assumption that the Hall of Fame Selection Committee acts in a reasonably rational manner, and has a reason for each of its selections, even if the justification for using such a reason might be weak.

Last time we had a look at goaltenders and defencemen who played in what I call the Major-League Era, specifically the years 1912 to 1929 when the Stanley Cup became the domain of only a top few hockey leagues. Today we'll be looking at the forwards from this era. Remember that the system is designed so that every player with an Inductinator score of 100 or more meets the implicit Hall of Fame standards.

For most players, the criteria are pretty straightforward. If we look at the top man as an example, Newsy Lalonde. He earns 22 points for the senior-level hockey games he played in excess of 200, and another 42 points for the points he scored in excess of that number. He earns 67 points for his senior career points-per-game average; anyone in excess of 0.95 gets points for this, up to a maximum of 70. Lalonde receives 43 points for his 19 seasons of senior hockey; 14 is the minimum number to earn any points in this category. Newsy earns a ridiculous number of points for his top-four finishes in major-league scoring. He led a major league in scoring three times, was second once, third once and fourth four time, resulting in 112 points. Only Joe Malone (with four) and Fred Taylor (with five) led a major league in scoring more often during this period. Lalonde also served as a player-coach in the major leagues for nine seasons, and earns 60 points for that, giving him a total of 346. He was also head coach in the NHL for seven seasons after his playing career was over, but only those players with at least nine such seasons earn any points for it. It may seem odd to reward a player for something that happened after his playing career, but without this category there would be no way to explain Jack Adams' induction into the player category in 1959.

This isn't the only post-career accomplishment that has to be considered in this era to explain some player selections. You might notice Conn Smythe on the list below, with 60 points on the scale despite playing literally only a handful of senior games. All of these points come from the fact that he was the coach of a Canadian Olympic hockey team (in 1928). Without this massive amount of points, you could not explain Frank Rankin's induction; he was the coach of the 1924 team. Ranking was quite a good player, but had a very short career. His high career points-per-game gives him 47 points, and the other 60 come from the Olympics. It's even worse in the case of Steamer Maxwell, who is recognized as the coach of the 1920 Olympic team, and receives 100 points on the Inductinator scale for this. You can explain the extra 40 points either because he was the first Olympic coach, or because he had a longer senior career than Rankin or Smythe. Once again, Maxwell was a good player in his day, though he never played professionally. He was an extremely fast rover, but he used his speed largely in defence, and never scored very much. He's nowhere near the Hall of Fame purely as a player.

There are some other kludgy work-arounds needed in this era, awarding a large amount of points to a player for an accomplishment that would not seem to be worth that much at first glance. Shorty Green is probably the best example. Based on his playing career alone, his Inductinator score would be precisely zero. He was a decent player, but nothing special. There are two things for which he might be renowned, both of which arise from his captaincy of the 1924/25 Hamilton Tigers. This was the first (and to date, only) NHL club that went from worst to first in the span of a single season. Green was also the leader of the Hamilton player strike before the 1925 playoffs, which earned them a good deal of fame. So we can assign arbitrary values to these events, and give Short Green 50 points for each of them to get to the Hall. It's not terribly satisfying, but it works.

Rusty Crawford is another one. Based purely on his career numbers, despite his very long career Crawford would score only a 50. The only thing that sticks out about him at all, that other players cannot match, is the range of his major-league career. He is the only player from this, so far as I can tell, to have played for a major-league team in every Canadian province that had such a team (British Columbia, Alberta, Saskatchewan, Ontario and Qu├ębec). He played for the Vancouver Maroons, Calgary Tigers, Saskatoon Crescents, Toronto Arenas, Ottawa Senators and Quebec Bulldogs in his career. I can't find anyone else who meets this criteria. Newsy Lalonde missed out Alrberta and Tommy Dunderdale didn't play in Ontario. They're Hall of Famers nonetheless. Art Gagne and Eddie Oatman both also hit four provinces, but not five; Gagne missed BC and Oatman, Saskatchewan. So if we give Crawford 50 points for this feat, his induction makes sense.

Rewinding a bit, there are a number of things that Newsy Lalonde missed out on for Inductinator points. Players who won at least three Stanley Cup championships earn points for the feat, while Lalonde had only one. Captaining a Stanley Cup championship, and scoring a Cup-winning goal also garner points. Playing and scoring goals in the Olympics are also rewarded, as are Allan Cup accomplishments. The Hart and Byng awards are also valuable, though they arrived relatively late in this time period.

As you can see from the table below, there are a number of players who could just as easily be Hall-of-Famers as not. Bernie Morris, Corb Denneny, Harry Smith and Dubbie Kerr are all only a few points off of the 100 threshold. Personally I would have put each of these men in before Rusty Crawford among others, but the Inductinator is not about merit, about who should be in the Hall of Fame. It's about explaining who is in the Hall. It's an attempt to shed some light on history, not to call down the efforts of the selection committee.

We'll finish up our look at the Inductinator next week, when we examine the Hall-of-Fame players from the Challenge Era, up to 1911.

FORWARDHoFSCOREGPGAPTSPIM
Newsy Lalondeyes34634444394537806
Joe Maloneyes27727834573418221
Fred Tayloryes242206218110328219
Frank Nighboryes231438255119374324
Didier Pitreyes23134431379392457
Cy Dennenyyes17739831090400450
Dick Irvinyes16032436793460409
Ernie Russellyes15110017616192299
Duke Keatsyes150301234117351764
Frank Fredricksonyes145366246112358499
Harry Broadbentyes14138522463287829
Frank Foystonyes14036725582337206
Tommy Dunderdaleyes14030226074334609
Mickey MacKayyes138422274118392334
Jack Walkeryes13844426299361129
Hobey Bakeryes130416533982
Billy Burchyes12741216673239255
Jimmy Gardneryes1201699029119431
Frank Rankinyes10721630630
Scotty Davidsonyes10749521870150
Harry Watsonyes1066094201142
Gord Robertsyes10617120744251325
Tommy Smithyes10521336533398359
Jack Darraghyes10425820873281355
George Hayyes102410208118326145
Jack Adamsyes10229724956305518
Babe Dyeyes10128121648264221
Moose Goheenyes1011436515800
Barney Stanleyyes10126519094284257
Steamer Maxwellyes1003720123263
Shorty Greenyes100126751893183
Rusty Crawfordyes10030316569234435
Harry Hylandyes10015519234226398
Bernie Morrisno9923720283285139
Corb Dennenyno9835022572297365
Harry Smithno921122468254229
Dubbie Kerrno9116619145236340
Eddie Oatmanno85320198101299456
Tony Conroyno8418654146880
Art Gagneno8239517990269434
Louis Berlinguetteno803469257149304
Odie Cleghornno7729923165296444
Herb Druryno72294591675205
Cully Wilsonno6535520485289814
Fred Harrisno6128217581256449
Conn Smytheno6052020
Bert McCaffreyno5232110349152202
Jack McDonaldno3424419559254179
Carson Cooperno333412157428997
Ty Arbourno3137013769206184
Don Smithno2718918927216359
Billy Boucherno2525211641157442
Sibby Nicholsno219910227129150
Harry Meekingno1727410641147330
Charley Tobinno1420115439193139
Jimmy Herbertno112388933122255
Ken Mallenno1018218227209277
Harry Scottno91231787185182
Alf Skinnerno925711732149432
Carl Kendallno86733195252
Skene Ronanno513810825133244

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