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Data cleaning and Data preprocessing - mimuw.edu.pl

Preprocessing1 data cleaning andData preprocessingNguyen Hung SonThis presentation was prepared on the basis of the following public Han and Micheline Kamber, data mining , concept and techniques Piatetsky-Shapiro, kdnuggest , 2 Outline Introduction data cleaning data integration and transformation data reduction Discretization and concept hierarchy generation Summarypreprocessing 3 Why data preprocessing ? data in the real world is dirty incomplete: lacking attribute values, lacking certain attributes of interest, or containing only aggregate data noisy: containing errors or outliers inconsistent: containing discrepancies in codes or names No quality data , no quality mining results! Quality decisions must be based on quality data data warehouse needs consistent integration of quality datapreprocessing 4 data Understanding: Relevance What data is available for the task?

preprocessing 3 Why Data Preprocessing? Data in the real world is dirty incomplete: lacking attribute values, lacking certain attributes of interest, or containing only aggregate data noisy: containing errors or outliers inconsistent: containing discrepancies in codes or names No quality data, no quality mining results! Quality decisions must be based on quality data

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