The task of clustering Web sessions is to group Web sessions based on similarity and consists of maximizing the intra-group similarity while minimizing the inter-group similarity．The first and foremost question needed to be considered in clusteringW b sessions is how to measure the similarity between Websessions．However．there are many shortcomings in traditiona1measurements．This paper introduces a new method for measuringsimilarities between Web pages that takes into account not only theURL but also the viewing time of the visited web page．Yhen wegive a new method to measure the similarity of Web sessions usingsequence alignment and the similarity of W eb page access in detailExperiments have proved that our method is valid and e币cient．
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