Data Preprocessing a Data Preprocessing: An Overview ◆ Data Quality Major Tasks in Data Preprocessing a Data Cleaning u Data Integration ■ Data reduction Data Transformation and data discretization ■ Summary 同济大学软件学院 ool of Software Engineering. Tongpi Unversity1212 Data Preprocessing ◼ Data Preprocessing: An Overview ◆ Data Quality ◆ Major Tasks in Data Preprocessing ◼ Data Cleaning ◼ Data Integration ◼ Data Reduction ◼ Data Transformation and Data Discretization ◼ Summary