motherscratcher wrote: Pros, in light of the way this discussion has gone, why would it be so hard to say something like "Jeez, I didn't realize all of the problems with this stat. Thanks, I feel like I know more now."? Or something to that effect. Just "Hey, I didn't realize that stat had so many flaws."
Why continue to argue for something that seems to be so completely wrong?
Anyway, that's what I get reading through this thread and the main thing I can't figure out.
I said I was done with this topic but I didn't anticipate someone asking an intelligent, honest question.
My answer is this: The +/- stat does not have any "flaws". No statistic does. Stats are simply mathematical expressions of true facts. The flaw comes in the way they are applied or misapplied.
You like baseball stats? Me, too. Who led the Tribe pitching staff in ERA last year? Answer: Andy Marte. One inning pitched, 0.00 ERA. That is not a flawed stat - it's a dead-on mathematical representation of his performance. If I tried to use that number to argue that Marte was the best pitcher on the team, the flaw would be in my application, not in the stat itself.
Any stat is worthless if the sample size is tiny. One game means nothing, whether it be baseball or basketball. I would be laughed off the board if I posted the box score of the Tribe's first game showing Fausto had an ERA of 30.00 and then claiming it was proof that ERA is a meaningless stat because Fausto is an All-Star pitcher. But when Peeker posted the box score of a single Miami Heat game as proof that +/- is a meaningless stat, everybody just nodded their heads.
I think +/- has some value when comparing players on the same team that play significant minutes over a substantial part of the season. As with any stat you can't just throw it around carelessly.
Last year I was watching Cavs games and it seemed like Shaq was hurting the team in a lot of ways. I checked his +/- and sure enough it was among the lowest on the team. I thought AV did a lot of little things to help score and deny points that don't show up in the box score. I checked his +/- and he was right up there behind LeBron. The stats supported my observations.
Peeker was hard on JJ Hickson earlier this year even though his scoring and rebounding numbers were among the best on the team. JJ's +/- is among the lowest of the guys who get a lot of minutes, suggesting Peeker knows what he's talking about. Peeker also observed that Baron Davis helps the team when he's on the floor, and sure enough, his +/- is the best on the team.
If you like advanced stats, basketball-reference.com came up with something called "Win shares per 48 minutes" which had Shaq at 0.119 last year, which was 7th on the Cavs, with the league average being 0.100. His best year was with the Lakers in '99-'00 when he was something like 0.287. This year the Cavs leaders were AV, Sessions, and Davis in that order, with JJ Hickson 12th.
Like I said, the value of any stat is how well you apply it, and if +/- is applied properly I think it has some usefullness in a discussion. Where it falls on the continuum between "shit" and "take it to the bank" is open for debate. I just think both extremes are incorrect. The fact that an award-winning sportswriter and a basketball site that exists for statistical analysis both use it makes me think it's worth something more than dog crap. But I'm no missionary trying to convert the masses. If people don't like the stat, fine. If it's going to generate this much angst I'll refrain from mentioning it again.