Base-Out Percentage

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Base-Out Percentage (BOP) is a measure of offensive productivity developed by Barry Codell. It is a ratio of bases gained to outs made, and as such is similar to Tom Boswell's Total Average. BOP preceded Total Average, although the latter has become more widely known, likely due to its greater exposure in Boswell's work.

BOP = (TB + W + HB + SB + SH + SF)/(AB - H + CS + SH + SF + GIDP)