Re: Belief Network

Hi

repairman2003@xxxxxxxxx wrote:
I'm working on a belief network with probabilites.
The query ?-prob(daughter_can,[],P). Should return 0.01 but I'm unsure
of how to make it work.
Thanks for any help

Your belief network is not complete.
A belief network consists of:

1) A list of conditional probabilities.
i.e. values for P(A|B)
2) A list of conditional independences.
i.e. knowledge of P(A|B C) = P(A|B)

You need 1) and 2). If you only have 1)
you can hardly do something.

In your case, if you are sure that
P(_can|_mut _grand_mut) = P(_can|_mut) holds,
then P(_can _mut _grand_mut) = P(_can|_mut)*
P(_mut|_grand_mut) * P(_grand_mut). And you
can then compute P(_can) = sum P(_can _mut _grand_mut).

Very good introduction:
Probabilistic similarity networks / David E. Heckerman
Cambridge, Massachusetts [etc.] : The MIT Press, cop. 1991
234 S. ; 24 cm
ACM Doctoral dissertation awards. 1990
ISBN 0-262-08206-3

Not bad:
Expert systems and probabilistic network models /
Enrique Castillo, José Manuel Gutiérrez, Ali S. Hadi
New York [etc.] : Springer, cop. 1997
XIV, 605 S. ; 25 cm : 250 Ill.
Monographs in computer science
0-387-94858-9
.