[Cool Stats] ASPM graphs

I thought the graphs at this page were pretty cool, and he provides a really nice explanation on how it works.

http://godismyjudgeok.com/DStats/aspm-and-vorp/

For ASPM stats and visualization for 2012 season:

http://godismyjudgeok.com/DStats/aspm-and-vorp/2012-aspm/

 

Keep in mind that ASPM tells us only as much as the boxscore can tell us, and nothing more.

The idea is to come up with a formula based on boxscore stats that predicts offensive and defensive adjusted +/- (in this case, regularized adjusted +/- or RAPM). As he shows, the correlation between DASPM and D-RAPM is much less than the correlation between OASPM and O-RAPM. Which makes sense, because the boxscore has better measures for offense than it does for defense.

As such, we should have less confidence in its defensive ratings than its offensive ratings. In the case of Patrick Patterson, ASPM says he's not a good defender based on his boxscore stats. I think a major reason for that is his poor defensive rebounding%. Undoubtedly, the historical trend is for strong defenders to be good at defensive rebounding. But I think he also does a lot of good things on defense which simply don't show up directly or indirectly in a boxscore that ASPM misses.