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A COMPARISON OF SOME ROBUST BIVARIATE CONTROL CHARTS FOR INDIVIDUAL OBSERVATIONS
Journal: International Journal for Quality Research (Vol.8, No. 2)Publication Date: 2014-06-30
Authors : Moustafa Omar Ahmed Abu - Shawiesh; Florence George; Golam B. M. Kibria;
Page : 183-196
Keywords : Bivariate control chart; False Alarm; Hotelling's T2 statistic; Outliers; Robust estimation; Simulation Study; Statistical process control;
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Abstract
This paper proposed and considered some bivariate control charts to monitor individual observations from a statistical process control. Usual control charts which use mean and variance-covariance estimators are sensitive to outliers. We consider the following robust alternatives to the classical Hoteling's T2: T2MedMAD, T2MCD, T2MVE a simulation study has been conducted to compare the performance of these control charts. Two real life data are analyzed to illustrate the application of these robust alternatives.
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Last modified: 2015-11-21 22:59:05