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Go up to 1 Qualitative Effect of Observations in Belief Networks

Solution to part (d)

Suppose you had observed a value for variable F. What other variables could have their belief changed as a result of this observation?

Answer: A, B, C, D, E, G, H, and I.

All of the ancestors of F, (namely C, E, and G) and all of their descendants. This means all variables except J can have their belief changes as a result of observing F.

Computational Intelligence online material, ©David Poole, Alan Mackworth and Randy Goebel, 1999

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