Memory‐Type Control Charts for Monitoring the Process Dispersion

as floating TS 2 and floating US 2 control charts, respectively. The average run length (ARL) performance of the proposed charts is evaluated through a simulation study and is also compared with the CUSUM and EWMA charts for process dispersion. It is found that the proposed charts are better in detecting both positive as well as negative shifts. An additional comparison shows that the floating US 2 chart has slightly smaller ARLs for larger shifts, while for smaller shifts, the floating TS 2 chart has better performance. An example is also provided which shows the application of the proposed charts on simulated datasets. Copyright © 2013 John Wiley & Sons, Ltd.

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