This book constitutes the refereed proceedings of the 6th European Conference on Principles of Data Mining and Knowledge Discovery， PKDD 2002， held in Helsinki， Finland in August 2002.The 39 revised full papers presented together with 4 invited contributions were carefully reviewed and selected from numerous submissions. Among the topics covered are kernel methods， probabilistic methods， association rule mining， rough sets， sampling algorithms， pattern discovery， web text mining， meta data clustering， rule induction， information extraction， dependency detection， rare class prediction， classifier systems， text classification， temporal sequence analysis， unsupervised learning， time series analysis， medical data mining， etc.
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