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Spam Filter Batting Average

Wiki Markup\[ John Graham-Cumming\] proposed this uniform measure of spam-filter effectiveness in \[ his November 16, 2004 article entitled 'Understanding Spam Filter Accuracy'\].

Essentially, it's a reformatting of the FalsePositive percentage and FalseNegative percentage, as 'spam hit rate / ham strike rate'. This can be computed from FP%/FN% as follows: