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...Data mining concepts and techniques chapter nd edition han kamber note materials of this presentation are from textbook unless mentioned otherwise jiawei department computer science university illinois at urbana champaign www cs uiuc edu hanj micheline all rights reserved february preprocessing why preprocess the descriptive summarization ch rdedition cleaning integration transformation reduction discretization concept hierarchy generation summary in real world is dirty incomplete lacking attribute values certain attributes interest or containing only aggregate e g occupation noisy errors outliers salary inconsistent discrepancies codes names age birthday was rating now a b c discrepancy between duplicate records...