From: "Alan DeKok" <aland(_at_)freeradius(_dot_)org>
As an absolute number, false positive should be easy to define. "I
went through my 'spam' folder, and I decided that 3 messages should
not have been put there."
True, but such absolute numbers in isolation are merely boring noise.
Whether the number is 3 or 1,000,000 (eg. recently from AOL), it is
meaningless without some clue about the number of other messages.
As a ratio or percentage, false positives are taken relative to the
desired signal, not to the total data, or to the noise. ...
...
The ratio of false positives = FP / MAIL
The ratio o false negatives = FN / MAIL
So say you and I, but not everyone else. There is no canon that
sanctifies any particular definition of a "spam ratio," at least
not yet.
Vernon Schryver vjs(_at_)rhyolite(_dot_)com
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