SEDL / STP / STP1097-EB / STP25442S

On the Robustness of a Class of Continuous Sampling Plans under Certain Types of Process Models

Lasater, HA
Vice President, Tennessee Associates International, Inc., Maryville, Tennessee

Pages: 14    Published: Jan 1990

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Abstract

Harold F. Dodge in 1945 defined an acceptance sampling plan, CSP-1, for inspecting a continuous sequence of units or lots which are outputs from a process operating in statistical control. The plan is to guarantee there will be a maximum average percent of nonconforming units in the inspected units equal to a selected Average Outgoing Quality Limit (AOQL). For twenty-six plans investigated when process conditions differ from those of Dodge, the average percent nonconforming only in a finite number of units inspected will be less than or equal to the AOQL of Dodge. Also, when the process percent nonconforming is changing according to certain patterns investigated, the average percent passing inspections will be practically no larger than the AOQL under Dodge assumptions.