How to calculate conditional probability?

Panos

2011 11 9

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Given two vectors X and Y how can we calculate P(X/Y). I need it for the Naive Bayes Classification Algorithm. Note: X and Y can have two or more same elements. For example X=[1 1 2 3 4 4 2 3 5] Y=[ 3 3 4 1 2 2 2 7 8]

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Daniel Shub 2011-11-9

You cannot. You need more than just independent observations of X and Y, you need paired observations of X and Y together, in other words something like a matrix.

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