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Estimation of Mutual Information in Two-Class Pattern Recognition

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2 Author(s)
Butler, G.A. ; Judson B. Branch Research Center, Allstate Insurance Company ; Ritea, H.B.

Although mutual information (MI) has been proposed for some time as a measure of the dependence between the class variable and pattern recognition features, it is only recently that the practical problems of designing computer programs to use MI have been raised. Within the two-class context, this paper compares two traditional approaches to the requisite entropy estimation (using the maximum likelihood and expected value estimators of class probabilities) with a new estimator: the expected value of binomial entropy (E). The latter is shown to be superior where one class has a priori dominance. E is also related to expected probability of error and, in a surprising result, it is shown that E is a better estimator of class probabilities than the maximum likelihood and expected value estimators over a wide range.

Published in:

Computers, IEEE Transactions on  (Volume:C-23 ,  Issue: 4 )

Date of Publication:

April 1974

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