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QICID: 30607
Title: Combined Charts for Mean and Variance Information
Copyright: ASQ
Author: Hawkins, Douglas M.; Deng, Qiqi
Organization: School of Statistics, University of Minnesota; Boehringer Ingelheim Pharmaceuticals, Inc.
Subject: Process control; Variance (statistics); Monitoring; Control charts; Likelihood methods; Shewhart control chart; X-bar control charts;
Series: Journal of Quality Technology, Vol. 41, No. 4, October 2009, pp. 415-425
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Abstract: [This abstract is based on the authors' abstract.]
Monitoring the mean and variability of a process has traditionally been done using separate X-bar and S charts. Several published studies have shown it is possible to monitor both the mean and variance using a single chart responsive to shifts in either effect. Two new combination charts are proposed that may have performance advantages over the X-bar and S chart pair.
Number of pages: 11
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