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- W2950552905 abstract "This paper examines the quantities used by MYCIN to reason with uncertainty, called certainty factors. It is shown that the original definition of certainty factors is inconsistent with the functions used in MYCIN to combine the quantities. This inconsistency is used to argue for a redefinition of certainty factors in terms of the intuitively appealing desiderata associated with the combining functions. It is shown that this redefinition accommodates an unlimited number of probabilistic interpretations. These interpretations are shown to be monotonic transformations of the likelihood ratio p(EIH)/p(El H). The construction of these interpretations provides insight into the assumptions implicit in the certainty factor model. In particular, it is shown that if uncertainty is to be propagated through an inference network in accordance with the desiderata, evidence must be conditionally independent given the hypothesis and its negation and the inference network must have a tree structure. It is emphasized that assumptions implicit in the model are rarely true in practical applications. Methods for relaxing the assumptions are suggested." @default.
- W2950552905 created "2019-06-27" @default.
- W2950552905 creator A5016386034 @default.
- W2950552905 date "2013-03-27" @default.
- W2950552905 modified "2023-09-27" @default.
- W2950552905 title "Probabilistic Interpretations for MYCIN's Certainty Factors" @default.
- W2950552905 hasPublicationYear "2013" @default.
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