min_dev vs spam_cutoff [was: spam cutoff less than neutral? ]

[Boris 'pi' Piwinger]

David Relson wrote:

> The last step of the Robinson-Fisher algorithm, which is what bogofilter
> users, is a reverse chi-square test.  This test answers the question
> "for the number of tokens scored, and the spamicity seen, what is the
> likelihood that this message is spam?" 

Worse than that. The test only says something about the
failure of a hypothesis. This test only works in one
direction. So we need another test for the opposite
direction. Those two results are then combined into one
number which is *scaled* to fit the 0,1-interval.

pi