A new nonparametric composite exponentially weighted moving average sign control chart

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Raza M. A.; Aslam M.; Farooq M.; Sherwani R. A. K.; Bhatti S. H.; Ahmad T.

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Journal Paper

Paper Information

Journal: Scientia Iranica Year:2022 | Volume:29 | Issue:1 (Transactions B: Mechanical engineering) Page(s): 290-302

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Title

A new nonparametric composite exponentially weighted moving average sign control chart

Author(s)

Keywords

Average Run Length

Binomial distribution

EWMA statistic

Nonparametric Control Charts

Abstract

In this paper, a new nonparametric control chart based on two EWMA statistics is proposed for monitoring process deviation from the target value. The performance comparison of the proposed chart with the existing nonparametric EWMA sign control chart and a nonparametric CUSUM mean control chart are made by using out-of-control Average Run Length. The simulation study showed the superiority of the suggested chart over the four other parametric and nonparametric charts. An empirical illustration is also provided for performance evaluation of the proposed chart. By comparing the proposed chart with the existing charts, it is concluded that the proposed chart is more sensitive in detecting a small shift in the process.

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