ANSI/ASQC Z1.4 Performance Without Limit Numbers

Article

Grinde, Roger B.; McDowell, Edward D.; Randhawa, Sabah U.   (1987, ASQC)   Battelle Northwest; Oregon State University; Arizona State University

Journal of Quality Technology    Vol. 19    No. 4
QICID: 5583    October 1987    pp. 204-215
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Article Abstract

ANSI/ASQC Z1.4 is a widely used attributes acceptance sampling system. The latest revision of the standard makes optional the use of limit numbers for reduced inspection. This paper presents a Markov model of the sampling system without limit numbers. The model is valid for all single, double and multiple sampling schemes. Closed form, analytical results are developed for various performance measures. The maximum average run length on normal inspection is found to be only 12.7 lots, which leads to excessive switching between plots when quality is worse than the AQL.

Keywords

Sampling,Acceptable quality level (AQL),Markov chains,Switching rules


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