Automatic text categorization feature selection methods research

Text categorization is a task of classifying text documents into predefined set of categories based on their content,text represe-ntation is one of kernel technology of text categorization,and feature selection is one of key technology of text representation,it is very important to text categorization effect.Text feature selection is a process of recognizing and deleting redundant information and enhancing training documents cluster quality.The text feature selection methods are introduced,analysed and researched,including information gain,mutual information,2 statistics,document frequency,low loss dimensionality reduction,relative frequency difference.