DESIGN OF AN EXTENDED NONPARAMETRIC EWMA SIGN CHART
DOI:
https://doi.org/10.23055/ijietap.2015.22.6.1172Keywords:
Nonparametric control chart, EWMA sign chart, DEWMA sign chart, Detection abilityAbstract
Selecting the correct control chart is essential to effectively monitoring process shifts. In particularly, a nonparametric control chart is recommended over a traditional control chart when the quality characteristics of a process are unknown. In this paper, we extend the nonparametric exponentially weighted moving average (EWMA) sign chart to a double EWMA (DEWMA) sign chart to improve the detection ability in small process shifts. Simulation studies show that the nonparametric DEWMA sign chart performs better than the EWMA sign chart in detecting small process shifts, but that they perform similarly when detecting large shifts.Published
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