Bayes TheoremYou are currentlybrowsing as guest. Click here to log in 

Bayes' Theorem says that if event B has a nonzero probability of occurring, then when it does occur, we can compute the probability that event A also happened as follows:
See also:
A recent use of this theorem is spam filtering. Although the application is not strictly correct, it's close enough that it can be very effective. An alternative, or even supplementary spam filtering system uses Markov Chains.
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