The purpose of this research is to propose an appropriate classification approach to improving the effectiveness of spam filtering on the issue of skewed class distributions. A clustering-based classifier is proposed to first cluster documents into several groups, and then an equal number of keywords are extracted from each group to alleviate the problem caused by skewed class distributions. Experiments are conducted to validate the effectiveness of the proposed classifier. The results show

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... our proposed classifier can effectively deal with the issue of skewed class distributions in the task of spam filtering.