A new nonparametric composite exponentially weighted moving average sign control chart

Document Type : Article

Authors

1 Department of Statistics, Government College University Faisalabad, Faisalabad 38000, Pakistan

2 Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah 21551, Saudi Arabia

3 Department of Statistics, Government College University Lahore, Pakistan

4 College of Statistical and Actuarial Sciences, University of the Punjab Lahore, Pakistan

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.

Keywords


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