Skip Montanaro said: > > I've seen several recent references in SA-talk to "S/O" and "S/O Ratio". I > don't find it mentioned in the 2.30 sources I have laying about and googling > for it didn't turn up any obvious winners either. All I can think of is > "Spam to Ollie ratio". What is it really?
Spam-to-Overall Ratio: a Dan Q innovation! ;) it's the ratio of spam hits to all hits in a given corpus, ie. nspam s/o ratio = -------------- (nspam + nham) (Excuse my use of the "ham" terminology, but I like it ;) S/O ratio ranges from 0 to 1.0, and values nearer 0 mean more ham-hits, values nearer 1.0 mean more spam-hits. So 1.0 (for a normal, non-compensation test) is a perfect 100% spam, 0% false-positive test. Basically if a mail triggers any given rule, the rule's S/O ratio is the probability that that the mail is spam. (This means that it's exactly the same as the P(x) probability values used in Bayesian probability, BTW. [1]) Recently, it's what we've been using to measure test effectiveness. ([1]: In fact, it could be said that the proposed ranged GA evaluator effectively uses Bayesian probability with a second, perceptron layer on top, I think.) --j. ------------------------------------------------------- Sponsored by: AMD - Your access to the experts on Hammer Technology! Open Source & Linux Developers, register now for the AMD Developer Symposium. Code: EX8664 http://www.developwithamd.com/developerlab _______________________________________________ Spamassassin-talk mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/spamassassin-talk