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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.
  1. Suppose you had observed a value for variable G. What other variables could have their belief changed as a result of this observation?
  2. Suppose you had observed a value for variable I. What other variables could have their belief changed as a result of this observation?
  3. Suppose you had observed a value for variable A. What other variables could have their belief changed as a result of this observation?
  4. Suppose you had observed a value for variable F. What other variables could have their belief changed as a result of this observation?
  • Solution to part (a)
  • Solution to part (b)
  • Solution to part (c)
  • Solution to part (d)

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

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