Reduction of control-chart signal variablity for high-quality processes

C. Lai and K. Govindaraju

Journal of Applied Statistics, 2008, vol. 35, issue 6, 671-679

Abstract: The design of a control chart is often based on the statistical measure of average run length (ARL). A longer in-control ARL is ensured by the design, but the variance run length distribution may also be large for such a design. In practical terms, the variability in false alarms and true signals may be large. If the sample size for plotting a point is not constant, then the focus is on the average number inspected as against the ARL. This article considers two well-known attribute control chart procedures for monitoring high quality based on the number inspected, and shows how the variability in false alarms and correct signals can be reduced.

Date: 2008
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DOI: 10.1080/02664760801921232

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