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A continuous sampling plan using CUSUMs

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  • Patrick Bourke

Abstract

A Continuous Sampling Plan, CSP-CUSUM, is proposed based on the use of Cumulative Sums (CUSUMs) for deciding when to switch between the phases of sampling inspection and 100% inspection. The Geometric CUSUM, also termed the Run-length CUSUM, is chosen for this purpose, and two separate CUSUMs are to be operated, one for each inspection phase. The conventional measures of performance for CSPs such as average outgoing quality, average fraction inspected, and average proportion passed under sampling inspection are evaluated for CSP-CUSUM, and comparisons with some standard CSPs are presented. An additional performance-measure, Average Cycle Length, is proposed. A table is provided to aid the choice of parameters for the operation of CSP-CUSUM. It is recommended that a Geometric CUSUM control chart be maintained in parallel with CSP-CUSUM to detect significant upward shifts in the incoming fraction defective.

Suggested Citation

  • Patrick Bourke, 2002. "A continuous sampling plan using CUSUMs," Journal of Applied Statistics, Taylor & Francis Journals, vol. 29(8), pages 1121-1133.
    • Handle: RePEc:taf:japsta:v:29:y:2002:i:8:p:1121-1133
    DOI: 10.1080/0266476022000011201
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    References listed on IDEAS

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    1. K. Govindaraju & C. Kandasamy, 2000. "Design of generalized CSP-C continuous sampling plan," Journal of Applied Statistics, Taylor & Francis Journals, vol. 27(7), pages 829-841.
    2. Patrick Bourke, 2001. "The geometric CUSUM chart with sampling inspection for monitoring fraction defective," Journal of Applied Statistics, Taylor & Francis Journals, vol. 28(8), pages 951-972.
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