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Where did the Errors Happen ?
False Accepts 6 – 2 = 4
(2 spammers got onto previously well-credentialed lists)
False Rejects 2 – 2 = 0
(2 “users” violated rules on said lists
and were summarily bounced)
Note that it's almost impossible to tell the difference between the two cases!
Arguable N+1 Accuracy for Markovian Filter: