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A variable sampling interval S-2-EWMA control chart for monitoring the process variance

机译:可变采样间隔S-2-EWMA控制图,用于监视过程差异

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摘要

This paper proposes a Variable Sampling Interval version of the Fixed Sampling Interval S-2-EWMA control chart developed by Castagliola (2004) and dedicated to the monitoring of the sample variance of a process. In this paper, we explain how the various parameters of this VS, S-2-EWMA control chart can be computed and how the use of the VSI feature significantly improves the statistical efficiency of FSI S-2-EWMA chart, thus representing an effective tool in the detection of process out-of-control conditions. An optimal design strategy based on the Average Time to Signal (ATS) is presented and a comparison with the FSI procedure is performed.
机译:本文提出了由Castagliola(2004)开发的固定采样间隔S-2-EWMA控制图的可变采样间隔版本,专用于监视过程的样本方差。在本文中,我们解释了如何计算该VS,S-2-EWMA控制图的各种参数,以及如何使用VSI功能显着提高FSI S-2-EWMA图的统计效率,从而代表了一种有效的方法。用于检测过程失控条件的工具。提出了基于平均信号时间(ATS)的最佳设计策略,并与FSI程序进行了比较。

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