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About the Pythagorean Method for Calculating Win Pct.
The Pythagorean Method gives an expected winning percentage using the fact that the ratio of a team's wins and losses is related to the number of points scored by the team raised to some exponent, which is usually taken to be 16.5.
Expected Winning % = (Pts scored)^(16.5)/(Pts scored^(16.5) + Pts allowed^(16.5))
About statistical abbreviations