Statistical Gymnastics

Article

Quesenberry, Charles   (1998, ASQ)   North Carolina State University, Raleigh, NC

Quality Progress    Vol. 31    No. 9
QICID: 13360    September 1998    pp. 77-79
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Article Abstract

Control charts for short runs as suggested by Bothe and used by Gilbert and by Wise and Fair are invalid. Even if a process is stable, such charts display unpredictable point patterns. For a stable process, the existence of points outside the control limits should strongly imply parameter changes due to assignable causes. But in the Bothe approach, analysis of outlying points for short runs requires appeals to an inadequate statistical transformation. Terminology describing this transformation is misleading, as are Bothe's suggestions for construction of the charts.

Keywords

Control charts,Statistics,Short runs,Control limits


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