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内容説明 This book constitutes the refereed proceedings of the 13th Pacific-Asia Conference on Knowledge Discovery and Data Mining， PAKDD 2009， held in Bangkok， Thailand， in April 2009. The 39 revised full papers and 73 revised short papers presented together with 3 keynote talks were carefully reviewed and selected from 338 submissions. The papers present new ideas， original research results， and practical development experiences from all KDD-related areas including data mining， data warehousing， machine learning， databases， statistics， knowledge acquisition， automatic scientific discovery， data visualization， causal induction， and knowledge-based systems.