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The applicability of acceptance sampling with respect to process stability and control

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  • Timothy S. Vaughan

Abstract

This article examines the applicability of acceptance sampling and the effectiveness of Deming's kp rule in relation to the degree of process stability achieved through statistical process control techniques. A discrete‐event simulation model is used to characterize the correlation between the number of defective units in a randomly drawn sample versus in the remainder of a lot, in response to a number of system and control chart parameters. The model reveals that such correlation is typically present when special causes of variation affect the production process from time to time, even though the process is tightly monitored through statistical process control. Comparison of these results to an analogous mixed binomial scenario reveals that the mixed binomial model overstates the correlation in question if the state of the process is not necessarily constant during lot production. A generalization of the kp analysis is presented that incorporates the possibility of dependence between a sample and the unsampled portion of the lot. This analysis demonstrates that acceptance sampling is generally ineffective for lots generated by a process subject to statistical process control, despite the fact that the number of defectives in the sample and in the remainder of the lot are not strictly independent. © 1994 John Wiley & Sons, Inc.

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  • Timothy S. Vaughan, 1994. "The applicability of acceptance sampling with respect to process stability and control," Naval Research Logistics (NRL), John Wiley & Sons, vol. 41(5), pages 635-651, August.
  • Handle: RePEc:wly:navres:v:41:y:1994:i:5:p:635-651
    DOI: 10.1002/1520-6750(199408)41:53.0.CO;2-X
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    1. Michael H. Peters & Timothy S. Vaughan, 1992. "Evaluation of an integrated supplier‐buyer quality‐control system," Naval Research Logistics (NRL), John Wiley & Sons, vol. 39(1), pages 79-96, February.
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