Combined Heuristic
Each individual heuristic is independent of the others but works well only for some particular Web documents.
Certainty Measure (Stanford certainty theory)
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- Suppose CF(E1) & CF(E2) are two certainty factors for the same observation B, then the compound certainty factor of B is CF(E1) + CF(E2) - CF(E1) * CF(E2).
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- By using this rule repeatedly, it is possible to combine the results of evidence from any number of independent events.