关键词: 文本分类, 特征选择, CHI统计, 权值调整, 分散度, 集中度, 频度, ,

Abstract: This paper analyzes the factors which influence the CHI categorization accuracy and removes the negative correlation between the items and the category.The improved approach is applied to weight adjustment，obviously improving categorization quality.Furthermore，concentration information，distribution information and frequency information are introduced into the improved approach，which increases the categorization accuracy on the corpus of category uneven distribution.The experimental results verify the efficiency and probability of the improved CHI approach.

Key words: text classification, feature selection, CHI statistical approach, weight adjustment techniques, distribution information, concentration information, frequency information