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. email@example.com
Stochastics and Quality Control, 2009, vol. 24, issue 2, 269-286
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.
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