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A study on the g and h control charts

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  • Chanseok Park
  • Min Wang

Abstract

In this paper, we revisit the g and h control charts that are commonly used for monitoring the number of conforming cases between the two consecutive appearances of nonconformities. It is known that the process parameter of these charts is usually unknown and estimated by using the maximum likelihood estimator and the minimum variance unbiased estimator. However, the minimum variance unbiased estimator in the control charts has been inappropriately used in the quality engineering literature. This observation motivates us to provide the correct minimum variance unbiased estimator and investigate the theoretical and empirical biases of these estimators under consideration. Given that these charts are developed based on the underlying assumption that samples from the process should be balanced, which is often not satisfied in practice, we propose a method for constructing these charts with unbalanced samples. Finally, two real-data applications are provided for illustrative purposes.

Suggested Citation

  • Chanseok Park & Min Wang, 2023. "A study on the g and h control charts," Communications in Statistics - Theory and Methods, Taylor & Francis Journals, vol. 52(20), pages 7334-7349, October.
    • Handle: RePEc:taf:lstaxx:v:52:y:2023:i:20:p:7334-7349
    DOI: 10.1080/03610926.2022.2044492
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