Data Classification

Chapter 11

Text Classification

Charu C. Aggarwal

IBM T. J. Watson Research CenterYorktown Heights, NY [e-mail]

ChengXiang Zhai

University of Illinois at Urbana-ChampaignUrbana, IL [e-mail]

11.1 Introduction

The problem of classification has been widely studied in the database, data mining, and information retrieval communities. The problem of classification is defined as follows. Given a set of records D = {X1,…,XN} and a set of k different discrete values indexed by {1…k}, each representing a category, the task is to assign one category (equivalently the corresponding index value) to each record Xi. The problem is usually solved by using a supervised learning approach where a set of training data records (i.e., records with ...