On Thu, Jul 9, 2009 at 9:11 PM, Doug Pensinger<brig...@zo.com> wrote:

> I'd estimate the efficiency of my gmail filter is 99% or better.

That is a particularly uninformative statistic.

Much more interesting would be two figures: probability of false
positives ( number of real marked as spam / number of real), and
probability of false negatives (number spam passed as real / number of
spam).

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