I went back through the 2012 XRAPM data available at StatsfortheNBA, and gave it the same position adjustment I used for the 2013 data. The initial results were once again encouraging, so I'll be posting the Top 30 in terms of overall position adjusted XRAPM, for the 2012 season.
The issues with 8-man and 5-man position adjustments were discussed in the 2013 XRAPM article, so once again, I went with a 3-position system (Guards, Wings, Bigs). This gave me another high correlation to the original XRAPM values, without seeming to bias one position over another.
The issues with 8-man and 5-man position adjustments were discussed in the 2013 XRAPM article, so once again, I went with a 3-position system (Guards, Wings, Bigs). This gave me another high correlation to the original XRAPM values, without seeming to bias one position over another.
XRAPM - XRAPM (P) Correlation
I once again tested the original XRAPM and my position adjusted XRAPM (P) on their ability to explain same-season wins, as well as offensive/defensive efficiencies.
Original XRAPM
Position Adjusted XRAPM
Once again, the biggest discrepancy seems to be defense. This is expected, as my position adjustment's purpose is to mess with the D-XRAPM values, which are partially attributed to height. This may be because Bigs are naturally more important on defense then smaller players (agree), but it makes comparing players across positions rather difficult. Hopefully, this position adjustment helps.