Control Charts as a Tool in Data Quality Improvement

摘要

Control-charting has been successfully applied to two National Highway Traffic211u001eSafety Administration data systems to help improve and assure the quality of 211u001etheir data. This paper describes the methods used, illustrates the approach 211u001ethrough various examples, and discusses various technical issues in applying 211u001econtrol charts to these traffic safety data. The paper also explains the 211u001erationale of the methods in terms of statistical process control logic. Finally, 211u001ean example of nonrandomly missing data is given.