A COMPARISON OF SOME ROBUST BIVARIATE CONTROL CHARTS FOR INDIVIDUAL OBSERVATIONS

Moustafa Omar Ahmed, Abu-Shawiesh, Florence George, B. M. Golam Kibria

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.

Keywords: Bivariate control chart, False Alarm, Hotelling's T2 statistic, Outliers, Robust estimation, Simulation Study, Statistical process control

DOI:

Recieved: 01.03.2014  Accepted: 29.05.2014  UDC: 65.012.7

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