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When trying to duplicate 2K's rebound rating formulas, I thought the best method would be to disconnect my PS4 from the internet, then look at the original roster and see how that compared to the 2012-13 season.
Red is offensive and blue is defensive rebounding, unseen but still in the graph is Reggie Evans' ridiculous 38% defensive rebounding rate:

Something that is striking about both is whether it's on purpose or not, the ratings fit better to a second order polynomial, as seen here:

Thus, I used the polynomial formulas to stay as close to the 2K ratings as possible.
Offensive Rebounding = -1955.6 x OffReb% 2 + 761.66 x OffReb% + 26.461
Defensive Rebounding = -664.05 x DefReb% 2 + 539.74 x DefReb% - 5.3161
In general I only updated players who had a total of 800 minutes in the past year, then when calculating I generally used 2 parts 2013-14 and 1 part 2012-13. I felt that was a good way to temper the results if this season or last season was an outlying year without weighting 2012-13 too much. In addition, if a player performs better in the playoffs, I added the playoff statistics. I say, generally, because I did make exceptions for players with unique situations, such as Derrick Rose.
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