Log5
From Sabermetrics
The Log5 method is Bill James' name for a method of estimating the winning percentage when two teams meet, or the expected rates resulting from a batter/pitcher confrontation. While James developed the team method independently and the batter/pitcher method in conjunction with Dallas Adams, the team method is in fact equivalent to the Odds Ratio method and can be derived from Bayes formula.
Log5 for Teams
The expected winning percentage of team A versus team B is given by:
W%(A v. B) = W%(A)*(1 - W%(B))/(W%(A)*(1 - W%(B)) + (1 - W%(A))*W%(B))
