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Journal of the Korean Society for Library and Information Science

  • P-ISSN1225-598X
  • E-ISSN2982-6292

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Vol.39 No.2

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Empirical Study on Improving the Performance of Text Categorization Considering the Relationships between Feature Selection Criterea and Weighting Methods

Journal of the Korean Society for Library and Information Science / Journal of the Korean Society for Library and Information Science, (P)1225-598X; (E)2982-6292
2005, v.39 no.2, pp.123-146

(2005). Empirical Study on Improving the Performance of Text Categorization Considering the Relationships between Feature Selection Criterea and Weighting Methods. Journal of the Korean Society for Library and Information Science, 39(2), 123-146.

Abstract

This study aims to find consistent strategies for feature selection and feature weighting methods, which can improve the effectiveness and efficiency of kNN text classifier. Feature selection criteria and feature weighting methods are as important factor as classification algorithms to achieve good performance of text categorization systems. Most of the former studies chose conflicting strategies for feature selection criteria and weighting methods. In this study, the performance of several feature selection criteria are measured considering the storage space for inverted index records and the classification time. The classification experiments in this study are conducted to examine the performance of IDF as feature selection criteria and the performance of conventional feature selection criteria, e.g. mutual information, as feature weighting methods. The results of these experiments suggest that using those measures which prefer low-frequency features as feature selection criterion and also as feature weighting method, we can increase the classification speed up to three or five times without loosing classification accuracy.

keywords
문서범주화, 자동분류, 자질선정, 자질가중치, kNN 분류기, Text Categorization, Automatic Classification, Feature Selection, Feature Weighting Methods, kNN Classifier

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