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Acceptance sampling plan based on an exponentially weighted moving average statistic with the yield index for autocorrelation between polynomial profiles

Author

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  • Fu-Kwun Wang
  • Yeneneh Tamirat

Abstract

Acceptance sampling plans based on process yield indices provide a proven resource for the lot-sentencing problem when the required fraction defective is very low. In this study, a new sampling plan based on the exponentially weighted moving average (EWMA) model with yield index for lot sentencing for autocorrelation between polynomial profiles is proposed. The advantage of the EWMA statistic is the accumulation of quality history from previous lots. In addition, the number of profiles required for lot sentencing is more economical than in the traditional single sampling plan. Considering the acceptable quality level (AQL) at the producer's risk and the lot tolerance percent defective (LTPD) at the consumer's risk, we proposed a new search algorithm to determine the optimal plan parameters. The plan parameters are tabulated for various combinations of the smoothing constant of the EWMA statistic, AQL, LTPD, and two risks. A comparison study and two numerical examples are provided to show the applicability of the proposed sampling plan.

Suggested Citation

  • Fu-Kwun Wang & Yeneneh Tamirat, 2018. "Acceptance sampling plan based on an exponentially weighted moving average statistic with the yield index for autocorrelation between polynomial profiles," Communications in Statistics - Theory and Methods, Taylor & Francis Journals, vol. 47(19), pages 4859-4871, October.
    • Handle: RePEc:taf:lstaxx:v:47:y:2018:i:19:p:4859-4871
    DOI: 10.1080/03610926.2018.1454960
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