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What is a noisy or model?

  • A.A table in which the probabilities have been estimated noisily
  • B.A model in which the child is the logical or of its parents
  • C.A model that adds random noise to the conditional probabilities
  • D.A compact table assuming each cause acts independently

Answer: D

The noisy or assumes each parent independently fails to cause the child with its own probability, so a table exponential in the parents is replaced by one number per parent. It is the probabilistic generalisation of a disjunction and fits many medical models well. Estimation noise, the deterministic disjunction and added randomness are different notions. Replacing a general table with a parameterised family, when the family fits, is what makes large networks elicitable.

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