A new control chart based on the loess smooth applied to information system quality performance. (1st August 2012)

• Record Type: Journal Article
• Authors: Tao, Zhi; Liu, Fengkun; Shen, Fanglin; Suh, Michael; Booth, David
• Is Part Of: International journal of operational research. Volume 15:Number 1(2012)
• Page Start: 74
• Page End: 93
• Publication Date: 2012-08-01
• Subjects: loess smooth -- statistical process control -- outliers -- information system -- control chart -- operational research; Operations research -- Periodicals; 003.05
• Languages: English
• ISSNs: 1745-7645

Abstract

Sometimes to measure the performance of an information system, unusually long response times of database operation need to be identified. Compared with Lloyd's (1995) statistical process control chart, we propose an outlier resistant robust locally weighted scatterplot smooth (loess) based control chart that identifies effectively all the out of control points of operation in Lloyd's (1995) data. Our findings provide guidance to management in information system quality control and more generally to all control chart users in cases where outliers occur in the charted data.