Gini's Mean Difference Based Time-Varying EWMA Charts

Riaz Muhammad and Saddam Abbasi ()
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Riaz Muhammad: Department of Statistics, Quaid-e-Azam University, Islamabad, Pakistan. riaz76qau@yahoo.com

Stochastics and Quality Control, 2009, vol. 24, issue 2, 269-286

Abstract: The concept of time-varying control limits with reference to EWMA charts is briefly introduced and for the asymptotic control charts proposed by Riaz and Abbasi [Interstat : 3, 2007], a proposal of time-varying control limits is made. The proposed limits are subsequently compared with those of Riaz and Abbasi [Interstat : 3, 2007] asymptotic charts and different time-varying EWMA control structures based on the sample range R, the sample standard deviation S and Downton's estimator σ*. The probability of detection of outliers is used as comparison criterion.

Keywords: Control charts; Downton's estimator; EWMA control structures; location and scale parameters; normality; outliers (search for similar items in EconPapers)
Date: 2009
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Persistent link: https://EconPapers.repec.org/RePEc:bpj:ecqcon:v:24:y:2009:i:2:p:269-286:n:10

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DOI: 10.1515/EQC.2009.269

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