Summary
Acceptance sampling plans have been widely used in statistical quality control for several decades. The vast majority of the relevant research and development over this period has focused on two-class sampling plans that involve classifying product characteristics as either conforming or nonconforming with respect to specified acceptance requirements. In recent years, some developmental work has occurred with respect to three-class sampling plans that additionally involve classifying product characteristics as marginally conforming with respect to requirements. This work remains relatively unknown among practitioners and applications seem to be presently limited to control of undesirable microbiological presence in food. This paper presents a review of the key developmental contributions to three-class sampling plan theory and discusses some applications where such plans would provide a more effective means of quality control. Applications specific to the field of legal metrology, including case-studies where isolated lots are common and currently-used methods are problematic, are particularly examined.
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Palcat, F.A. (2006). Three-Class Sampling Plans: A Review with Applications. In: Lenz, HJ., Wilrich, PT. (eds) Frontiers in Statistical Quality Control 8. Physica-Verlag HD. https://doi.org/10.1007/3-7908-1687-6_3
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