Design Strategies for Individuals and Moving Range Control Charts

Article

Rigdon, Stegen E.; Cruthis, Emma N.; Champ, Charles W.   (1994, ASQC)   Southern Illinois University, Edwardsville, IL; Central Illinois Public Service Co., Springfield, IL; Georgia Southern University, Statesboro, GA

Journal of Quality Technology    Vol. 26    No. 4
QICID: 11390    October 1994    pp. 274-287
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Article Abstract

Individuals and moving range charts are often used when production volume is too low to justify rational subgrouping. This article considers several aspects of the design strategy for these charts. We have found that the X chart alone is nearly as efficient as the combined X-MR chart for detecting changes in the process variability. We recommend, however, that the control limits on the individuals chart be based on a short-term estimate of the process variability, such as the moving range, rather than on a long term estimate, such as the sample standard deviation of the process. We also consider the effects of nonnormality and autocorrelation.

Keywords

Average run length (ARL),X-bar control charts,Moving range control charts,Box-Cox model


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