Edit made on October 12, 2008 by GuestEditor at 11:10:10
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Bayes' Theorem says that if event /B/ has a non-zero
probability of occuring, then when it does occur,
we can compute the probability that event /A/ also
happened as follows:
This gives a sort of "inverse probability" calculation.
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.