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On performance of two-parameter Gompertz-based \(\overline{X}\) control charts. (English) Zbl 1437.62694

Summary: In this paper, two methods of control chart were proposed to monitor the process based on the two-parameter Gompertz distribution. The proposed methods are the Gompertz Shewhart approach and Gompertz skewness correction method. A simulation study was conducted to compare the performance of the proposed chart with that of the skewness correction approach for various sample sizes. Furthermore, real-life data on thickness of paint on refrigerators which are nonnormal data that have attributes of a Gompertz distribution were used to illustrate the proposed control chart. The coverage probability (CP), control limit interval (CLI), and average run length (ARL) were used to measure the performance of the two methods. It was found that the Gompertz exact method where the control limits are calculated through the percentiles of the underline distribution has the highest coverage probability, while the Gompertz Shewhart approach and Gompertz skewness correction method have the least CLI and ARL. Hence, the two-parameter Gompertz-based methods would detect out-of-control faster for Gompertz-based \(\overline{X}\) charts.

MSC:

62P30 Applications of statistics in engineering and industry; control charts
62E15 Exact distribution theory in statistics
60E05 Probability distributions: general theory
62M10 Time series, auto-correlation, regression, etc. in statistics (GARCH)
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