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1 Qualitative Effect of Observations in Belief Networks
Consider the following belief network:
We say a variable is independent of another variable in a belief
network if it is independent for all probability distributions
consistent with the network. In this question you are to consider what
variables could have their belief changed as a result of
observing a value for variable X, in other words what
variables are not independent of X.
- Suppose you had observed a value for variable G.
What other variables could have their belief changed as a result of
this observation?
- Suppose you had observed a value for variable I.
What other variables could have their belief changed as a result of
this observation?
- Suppose you had observed a value for variable A.
What other variables could have their belief changed as a result of
this observation?
- Suppose you had observed a value for variable F.
What other variables could have their belief changed as a result of
this observation?
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material, ©David Poole, Alan Mackworth and Randy Goebel, 1999