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A modified form of Bill James' Pythagorean formula previously used in our Adjusted Standings calculations, since replaced by Pythagenpat.
Pythagenport was the first such formula to use the team's run environment to modify what in the original formula had been a fixed exponent (2 or 1.83), deriving the exponent as X = .45 + 1.5 * log10 ((rs + ra)/g). The winning percentage is then calculated as (rs^x)/(rs^x + ra^x). The formula has been tested for run environments between 4 and 40 runs per game, but breaks down below 4 rpg. The original article is here.
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