Indian Journal of Science and Technology

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Objectives: This paper aims at presenting an easy method of designing Single Sampling Plans (SSP) by attributes inspection based on Dodge-Romig method under Average Quality Protection. Methods/Statistical Analysis: A computational algorithm is developed for obtaining the parameters of the SSP, viz., the sample size and the acceptance number. A simple computer programme under the Poisson model for the OC function is developed for the computational algorithm using which the parameters of the SSP for desired levels of Average Outgoing Quality Limit (AOQL). Findings: The sample size and acceptance number constituting the SSP obtained using the procedure described in this paper are found to provide closer values of the desired AOQL and the minimum Average Total Inspection (ATI) than those obtainable from Dodge and Romig. The simple computer programme replaces the huge volumes of tables of Dodge and Romig. The procedure avoids the approximations involved in the original Dodge-Romig method and thus results in better plans. Application/ Improvements: The Single Sampling Plans under average quality protection are applicable in attributes inspection where ever rectification is possible.

Keywords

Average Outgoing Quality Limit (AOQL), Average Total Inspection (ATI), Operating Characteristic (OC) Function, Poisson Distribution, Single Sampling Plan (SSP)
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