The best explanation of rebound rate I can find is this:
Rebound Rate - While rebounds per 48 minutes is a very good way to evaluate rebounders, you can do even better by taking into account that some players have the opportunity to grab more rebounds than others. The most fair way to evaluate rebounders is by percentage of all missed shots when they are in the game that they rebound. (This is usually estimated by their team's and opponent's rebounds per minute). This is known as Rebound Rate or Rebound Percentage (Reb%).
Reb% = Reb / (((TmReb + OppReb)/TmMin)*Min)
http://www.nba.com/sonics/news/stats101.html
So it accounts for things like pace and minutes played, which can be confounding factors in traditional rebound per game stats.
It does not account for quality of rebounding of teammates, though, which is a good point to raise. I actually had the same thought after posting-- maybe Curry's low and declining reb-r numbers had a lot to do with Chandler's high and increasing reb-r numbers (14.4, 15.6, 18.9, 19.8). Without giving it too much thought, though, it seems like it'd be rather difficult to do meaningful adjustments based on quality of teammates.
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