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Certainty Factors do adhere to the rules of Bayesian statistics, but it can
represent tractable knowledge systems:
- Individual rules contribute belief in an hypotheses -- basically a
conditional probability.
- The formulae for combination of evidence / hypotheses basically assume
that all rules are independent ruling out the need for joint probabilities.
- The burden of guaranteeing independence is placed on the rule writer.
dave@cs.cf.ac.uk