For what it's worth, the Celtics are 3rd in the NBA in terms of defensive rebound rate:
http://www.basketball-reference.com/leagues/NBA_2011.html
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(You need to look at rate stats, rather than at raw numbers, to account for things like pace, etc.)
wow, thanks Roy, this is what I have been harping on for a couple of years. Defensive rebounding rate is really the only thing that matters. It takes into account how low we keep the opponent's fg% and leaves out offensive rebounds which we choose not to go after as a strategy matter. The above site is great, a little confusing though, for anybody that hasn't checked it out or couldn't make sense of it, scroll down to miscellaneous stats, and check DRB%, that is the key stat. You can click on it and the table will arrange itself by it, and you will see the c's are a surprising 3rd and well above the league average.
Now, this is really the way rebounding stats should always be talked about, in box scores, on TV, etc, always as percentages. Thanks again Roy, as much as I have been arguing for this I didn't know of resources that did it. I started a post about this a week or so ago, something like "my annual plea, help rebounding stats make sense," if anybody wants to get in on that argument. Its about the rate.