Process monitoring of exponentially distributed characteristics through an optimal normalizing transformation

Zhenlin Yang and Min Xie

Journal of Applied Statistics, 2000, vol. 27, issue 8, 1051-1063

Abstract: Many process characteristics follow an exponential distribution, and control charts based on such a distribution have attracted a lot of attention. However, traditional control limits may be not appropriate because of the lack of symmetry. In this paper, process monitoring through a normalizing power transformation is studied. The traditional individual measurement control charts can be used based on the transformed data. The properties of this control chart are investigated. A comparison with the chart when using probability limits is also carried out for cases of known and estimated parameters. Without losing much accuracy, even compared with the exact probability limits, the power transformation approach can easily be used to produce charts that can be interpreted when the normality assumption is valid.

Date: 2000
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DOI: 10.1080/02664760050173373

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