Production
https://prod.org.br/doi/10.1590/0103-6513.209916
Production
Article

Economic design of a nonparametric EWMA control chart for location

Hariba, Patil Subhash; Tukaram, Shirke Digambar

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Abstract

In this article, we have proposed an economic design of Exponentially Weighted Moving Average control chart based on sign statistic to control location parameter of the process. The economic performance of the chart is evaluated for different shifts in the location. It is observed that, as shift in the process location increases, sample size to detect the shift and the loss cost from the process decrease. The power of the chart increases with increasing shift. The design gives better economic/statistical performance for large shifts in the process. This economic procedure can be applied to any process having known or unknown process outcome distribution. The sensitivity of the design is also carried out to check the effect on statistical as well as economic performance of the design due to change in different time and cost parameters.

Keywords

Economic design, Production cycle, EWMA control chart, Markov chain, Expected loss.

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