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Monitoring the mean and the variance of a stationary process

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We deal with the problem of how deviations in the mean or the variance of a time series can be detected. Several simultaneous control charts are introduced which are based on EWMA (exponentially weighted moving average) statistics for the mean and the empirical variance. The combined X − S2 EWMA chart is extended to time series. Further simultaneous charts are considered. The comparision of these schemes shows that the residual attempt must be favored if a variance change is present.
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Keywords: EWMA charts; Statistical process control; simultaneous control charts; time series

Document Type: Original Article

Affiliations: European University Viadrina, Department of Statistics, D-15207 Frankfurt (Oder), FRG

Publication date: February 1, 2002

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