Two Novel Term Weighting For Text
Categorization
Author(s)
L. A. Matsunaga & N. F. F. Ebecken
Abstract
In text categorization (TC) based on the vector space model, documents are
represented as a vector, where each component is associated with a particular
term from the text collection vocabulary. Traditionally, each component value is
assigned using the information retrieval (IR) TFIDF measure. While this
weighting method seems very appropriate for IR, weighting methods that take
into account the importance of the term to the discrimination of the categories
may provide better results in TC. To apply this idea, we use in this work variants
of TFIDF weighting, where the idf part is replaced by functions used to conduct
term selection.
In an approach on real-world data to automatically distribute the legislative
bills to the committees at the Federal District Legislative Assembly in Brasília,
Brazil, the replacement of the idf part in TFIDF by a new term selection measure
– absl-logit – and by bi-normal separation [1] produced the best general
classification results with support vector machines (SVM), when compared with
TFIDF and with the use of common term selection measures – chi-square,
information gain, gain ratio and odds ratio – to replace the idf part in TFIDF.
Keywords: term weighting, text categorization, text classification.
1 Introduction
Text categorization (TC) is the task of automatically assigning unlabelled
documents into predefined categories. In TC based on the vector space model, a
document is represented as a vector dti
= [wi1, ..., wip], where p is the size of the
text collection vocabulary (number of terms of the dictionary of terms used).
Keywords
term weighting, text categorization, text classification.
Related Book
Other papers in this volume
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