Pythagorean Record

From SoSH

A formula for converting a team’s Run Differential into a projected Won/Loss record. The formula is RS^2/(RS^2+RA^2). Differences between teams Pythagorean Record and actual record can usually be attributed to luck. Another common exponent is 1.83.

You can improve the accuracy of the Pythagorean formula by using a different exponent (the 2 in the formula). In particular, a sabermetrician named US Patriot discovered that the best exponent can be calculated this way: (RS/G+RA/G)^.285, where RS/G is Runs Scored per game and RA/G is Runs Allowed per game. This is called the PythagoPat formula.