How do I get a conditional probability table?

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Gary
Posts: 40
Joined: Thu Nov 17, 2016 2:38 am

How do I get a conditional probability table?

Post by Gary » Mon May 15, 2017 8:06 am

Hi
Suppose there are three nodes, A, B, c
A->c B->c that is, A and B are the parent nodes of the c-node.
We know that P (A), P (B), P (c | A), P (c | B),How do I get the conditional probability table for c when I set up a Bayesian network in GeNie?
If the parent node is too much, CPT also need to enter one by one?

marek [BayesFusion]
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Posts: 299
Joined: Tue Dec 11, 2007 4:24 pm

Re: How do I get a conditional probability table?

Post by marek [BayesFusion] » Mon May 15, 2017 8:22 pm

I'm afraid no Bayesian network software will allow you to do that -- you have a theoretical problem. You need P(C|AB) and have only P(C|A) and P(C|B). Without special assumptions about the interaction, you are facing an under-constrained problem.

Please look at the canonical models (Section "Components of GeNIe models" and then "Canonical models"). Even there, though, you need to have P(C|A~B) and P(C|~AB).
I hope this helps,

Marek

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