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Optimum simultaneous discretization with data grid models in supervised classification: a Bayesian model selection approach

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Abstract

In the domain of data preparation for supervised classification, filter methods for variable ranking are time efficient. However, their intrinsic univariate limitation prevents them from detecting redundancies or constructive interactions between variables. This paper introduces a new method to automatically, rapidly and reliably extract the classificatory information of a pair of input variables. It is based on a simultaneous partitioning of the domains of each input variable, into intervals in the numerical case and into groups of categories in the categorical case. The resulting input data grid allows to quantify the joint information between the two input variables and the output variable. The best joint partitioning is searched by maximizing a Bayesian model selection criterion. Intensive experiments demonstrate the benefits of the approach, especially the significant improvement of accuracy for classification tasks.

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  1. Orange Labs, 2, Avenue Pierre Marzin, 22300, Lannion, France

    Marc Boullé

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  1. Marc Boullé
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Correspondence to Marc Boullé.

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Boullé, M. Optimum simultaneous discretization with data grid models in supervised classification: a Bayesian model selection approach. Adv Data Anal Classif 3, 39–61 (2009). https://doi.org/10.1007/s11634-009-0038-7

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