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   Project: kSpam (Managed by Nico Vis, Tom Lyne)
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SubjectkSpam uses combined probabilities
Created 10/16/2003 04:25 PM by Tom Lyne.
Modified<none> by <none>.
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Taken from http://www.paulgraham.com/naivebayes.html ;

If a and b are the probabilities associated with two independent pieces of evidence, then combined they indicate a probability of:


ab
-------------------
ab + (1 - a)(1 - b)


See also Paul's article on Bayesian filtering ;

http://www.paulgraham.com/spam.html

-Tom



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