Hi,
  Is it possible to change the prior based on a feature?

  For example, if I have the follow data (very simplified)

Class, Predicates

A, X
A, X
B, X

You would expect class A 2/3 of the time when the feature is just predicate X.

However, lets say I know that another feature Y that can take values {Q,R,S). 
P(A|Q)=0.8;P(A|R)=0.1;P(A|S)=0.3.

Is there any way to add feature Y to the classifier taking advantage of this 
information?
Thanks
Dan


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