Data Quality: Why Preprocess the Data? a Measures for data quality: A multidimensional view Accuracy: correct or wrong, accurate or not ◆ Completeness: not recorded, unavailable,… Consistency: some modified but some not, dangling Timeliness: timely update? e Believability how trustable the data are correct? Interpretability how easily the data can be understood? 同济大学软件学院 3 ool of Software Engineering. Tongpi Unversity3 Data Quality: Why Preprocess the Data? ◼ Measures for data quality: A multidimensional view ◆ Accuracy: correct or wrong, accurate or not ◆ Completeness: not recorded, unavailable, … ◆ Consistency: some modified but some not, dangling ◆ Timeliness: timely update? ◆ Believability: how trustable the data are correct? ◆ Interpretability: how easily the data can be understood?