I'm using it to compare players across eras in similar seasons. Let's just for example take Elmer Lach's age-30 season, 1947-48. That year, he was the 1st team All-Star Center, finished 3rd in Hart voting, and won the Art Ross, though Montreal did miss the playoffs. Montreal averaged 2.45 Goals For per game, while the league average was 2.92.
Here are his team splits (as it was post-war, his home/road splits have normalized 29 points in 30 away games, 32 points in 30 home games):
| 47-48 | Elmer | Lach | Total |
| Games | Goals | Assists | Points |
BOS (59) | 12 | 8 | 2 | 10 |
CHI (46) | 12 | 8 | 10 | 18 |
DET (72) | 12 | 3 | 4 | 7 |
MTL (51) | 0 | 0 | 0 | 0 |
NYR (55) | 12 | 6 | 6 | 12 |
TOR (77) | 12 | 5 | 9 | 14 |
| 60 | 30 | 31 | 61 |
| | 0.500 | 0.517 | 1.017 |
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Compare that to Sergei Fedorov's age-30 season. In 1999-2000, Fedorov played 68 games, going 27+35=62, +8. Detroit averaged 3.39 Goals For, much higher than the league average of 2.74. Detroit lost in the 2nd round of the playoffs.
Lach had a point on 42% of Montreal goals, while Fedorov only registered points on 22% of Detroit's goals. In the end though, I'd judge that Lach's year was much better than Fedorov's, as his post-season awards indicate.
Let's turn our attention to their age-26 seasons. That would be 1943-44 for Lach, and 1995-96 for Fedorov.
I posted Lach's full splits earlier in the thread, so you can see his huge discrepancy between away and home games, but here are his team splits:
| 43-44 | Elmer | Lach | Total |
| Games | Goals | Assists | Points |
BOS (43) | 10 | 6 | 10 | 16 |
CHI (49) | 10 | 1 | 14 | 15 |
DET (58) | 9 | 10 | 7 | 17 |
MTL (83) | 0 | 0 | 0 | 0 |
NYR (17) | 10 | 5 | 8 | 13 |
TOR (50) | 9 | 2 | 9 | 11 |
| 48 | 24 | 48 | 72 |
| | 0.5 | 1 | 1.5 |
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Lach was named to the 2nd team All-Star, and Montreal won the Stanley Cup in 9 total games, completing a dominant season where Montreal averaged 4.68 Goals For compared to a league average of 4.05, and lost 1 home game all year. Weirdly, despite Montreal's domination, none of their players received any votes for Hart or Lady Byng, and Bill Durnan was the only AS-1 nomination - Lach, Richard and Bouchard had to content themselves with 2nd team nominations.
Now you have Fedorov's age-26 season. In 78 games, he scored 39 goals and added 68 assists, for 107 points, and was a +49. Detroit averaged 3.96 Goals For per game, while the league average was 3.14. Detroit lost in the de-facto Stanley Cup finals against Colorado, as both teams would have handled Florida in the finals. Due to a deeper league in comparison to Lach's year, Fedorov finished a distant 5th in both Hart voting and in All-Star Center voting, while winning the Selke.
I'd argue that Fedorov's year was more impressive than Lach's year, though more due to the lesser competition because of the war as opposed to any outliers on team splits. For all I know, you might agree with me.
You also don't have to just compare individual season to individual season, you can also compare peak to peak, or prime to prime, and to me that's where I start to put more weight on team splits. You see that a player is 0.80 PPG for his career, then you look at his scoring environment to see how that helped or hurt, and then you look at team splits to try and gauge his true talent. I'm jumping around a bit, but take for example Ted Kennedy. You guys probably voted him in more for his Cups than his regular season performance, but his splits are shocking. His career PPG is 0.80, but look at the gaps between his points against "good" teams versus his points against "bad" teams.
Away | G | GPG | APG | PPG | | Home | GPG | APG | PPG | | Total | GPG | APG | PPG |
BOS | 71 | 0.324 | 0.282 | 0.606 | | 69 | 0.478 | 0.580 | 1.058 | | 140 | 0.400 | 0.429 | 0.829 |
CHI | 71 | 0.408 | 0.521 | 0.930 | | 71 | 0.479 | 0.620 | 1.099 | | 142 | 0.444 | 0.570 | 1.014 |
DET | 63 | 0.143 | 0.317 | 0.460 | | 68 | 0.382 | 0.382 | 0.765 | | 131 | 0.267 | 0.351 | 0.618 |
MTL | 71 | 0.155 | 0.324 | 0.479 | | 68 | 0.265 | 0.412 | 0.676 | | 139 | 0.209 | 0.367 | 0.576 |
NYR | 72 | 0.278 | 0.639 | 0.917 | | 72 | 0.375 | 0.639 | 1.014 | | 144 | 0.326 | 0.639 | 0.965 |
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Head-to-head results over the years against Detroit and Montreal are inconclusive, though I don't know how you'd judge expected results versus actual results. I don't have Sid Abel's team splits, but looking at Lach's, against Toronto he was a career .866 ppg player (.78 away, .94 home), compared to his career .94 average. That'd indicate to me that if Kennedy matched up against Lach, Lach had the better of that matchup, if you just look at scoring rates compared to their averages. That's the sort of place where I think you would find value in these team splits.
Sorry for such a rambling post, I was basically working this out in my head as I was typing this up. It's a variation of the argument I made about Frank Mahovlich, where I tried to show that if you took his prime years, when he made 6 straight All-Star teams, and compared it to a few modern wingers - Jamie Benn, Corey Perry, Marian Hossa - you'd see that over the same age period, in similar league scoring environments, those 3 wingers had the same or better stats than Mahovlich, but because of better league depth, not as much recognition. In fact, I still maintain that despite Marian Hossa's single AS-2 nomination over his entire career, his regular season performance to go along with his 3 Cups, 5 Finals and 7 Conference Finals, that his career was clearly better than Mahovlich's, even with his 6 Cups in 8 appearances, and 3 AS-1/6 AS-2 nominations.
Looking back at my argument, I should probably have deleted the Lach/Fedorov comparison, because it isn't very well articulated. I like the Kennedy/Lach stuff a bit better, because comparing careers or primes allows you to increase your sample size. Finally, I just want to mention that I'm not treating that Schmidt year as any sort of argument - it's just trivia. It just happens to be the most extreme sample-size performance I've found so far.