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Three-level control charts with variable sample size, sampling interval, and control limits

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  • Reza Pourtaheri

Abstract

Recently, three-level control chart has been developed for monitoring situations in which an appropriate quality measure uses three discrete levels to classify a product characteristic. In this paper, the variable parameters control charts for multinomial data are developed with a three-level classification scheme. We compare it with various adaptive charts to show that this modified scheme can improve the performance. In order to evaluate and compare the performance of this scheme, adjusted average time to signal is used as the performance measure. Results indicate that the proposed chart has improved performance and is relatively sensitive to small shifts.

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  • Reza Pourtaheri, 2017. "Three-level control charts with variable sample size, sampling interval, and control limits," Communications in Statistics - Theory and Methods, Taylor & Francis Journals, vol. 46(4), pages 1927-1940, February.
    • Handle: RePEc:taf:lstaxx:v:46:y:2017:i:4:p:1927-1940
    DOI: 10.1080/03610926.2015.1030426
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