On the improvement of one-sided S control charts

Athanasios C. Rakitzis and Demetrios L. Antzoulakos

Journal of Applied Statistics, 2011, vol. 38, issue 12, 2839-2858

Abstract: The most common charting procedure used for monitoring the variance of the distribution of a quality characteristic is the S control chart. As a Shewhart-type control chart, it is relatively insensitive in the quick detection of small and moderate shifts in process variance. The performance of the S chart can be improved by supplementing it with runs rules or by varying the sample size and the sampling interval. In this work, we introduce and study one-sided adaptive S control charts, supplemented or not with one powerful runs rule, for detecting increases or decreases in process variation. The properties of the proposed control schemes are obtained by using a Markov chain approach. Furthermore, a practical guidance for the choice of the most suitable control scheme is also provided.

Date: 2011
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DOI: 10.1080/02664763.2011.570320

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