http://bugzilla.spamassassin.org/show_bug.cgi?id=3118
Summary: bayes: error in our calculations
Product: Spamassassin
Version: SVN Trunk (Latest Devel Version)
Platform: Other
OS/Version: other
Status: NEW
Severity: major
Priority: P1
Component: Learner
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Henry reports:
(15:03:50) HenryCStern: but there is effectively an off-by-one error in your
naive Bayes calculations
(15:04:09) HenryCStern: if you derive everything using Bayes' theorem, you'll
see what I mean
(15:05:47) justinmason23: so we should multiply both $H and $S by ($nham /
$totalmsgcount) and ($nspam / $totalmsgcount) respectively to get correct
figures?
(15:05:57) HenryCStern: yeah
he brought it up before, but we all seem to have forgotten it. so let's file a
bug this time! ;)
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