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# On Predictive Classification of Binary Vectors

*Proceedings of the Sixth International Workshop on Artificial Intelligence and Statistics*, PMLR R1:239-242, 1997.

#### Abstract

The problem of rational classification of a database of binary vectors is analyzed by means of a family of Bayesian predictive distributions on the binary hypercube. The general notion of predictive classification was probably first discussed by S. Geisser. The predictive distributions are expressed in terms of a finite number observables based on a given set of binary vectors (predictors or centroids) representing a system of classes and an entropy-maximizing family of probability distributions. We derive the (non-probabilistic) criterion of maximal predictive classification due to J . Gower (1974) as a special case of a Bayesian predictive classification. The notion of a predictive distribution will be related to stochastic complexity of a set of data with respect to a family of statistical distributions. An application to bacterial identification will be presented using a database of Enterobacteriaceae as in Gyllenberg (1996 c). A framework for the analysis is provided by a theorem about the merging of opinions due to Blackwell and Dubins (1962). We prove certain results about the asymptotic properties of the predictive learning process.