
BGonline.org Forums
ResultsBased PR
Posted By: Rick Janowski
Date: Sunday, 1 February 2015, at 4:30 a.m.
In Response To: VRR  Challenge (Rick Janowski)
The following provides a methodology for obtaining an equivalent PR value based on results rather than error rate, but directly comparible with the conventional PR.
From Player Profile in XG (Players  All players summary) obtain the following data:
PRopp = Opponent's PR (All opponents)
N = Number of matches
L = Average Match Length
VRWR = Variance Reduced Win Rate = "Should have Won"/N
The equivalent PR derived from variance reduced results (rather than error rate) may be given by the following expression.
PRvrwr = PRopp +(2000*LOG10(1/VRWR  1))/L^0.5)/33
Thanks very much to Maik Stiebler for explaining the VRR methodology and how the various factors may be obtained from XG.

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