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This isn't original research. It was all in one of Bill James' books(I think an abstract between 1984 and 1988) but I can't remember which one. 65.78.5.10 23:21, 7 July 2007 (UTC)
I wonder why the denominator is AB rather than PA. Gidklio (talk) 20:02, 29 July 2011 (UTC)