Economic Efficiency Evaluation of Ltpd Variables Sampling Plans Based on Ewma Statistic
نویسنده
چکیده
The LTPD plans for acceptance sampling which minimize the mean inspection cost per lot of the process average quality when the remainder of the rejected lots is inspected were originally designed by Dodge and Romig for the inspection by attributes. The sampling plans for the inspection by variables were then proposed and it has been shown that such plans are in many situations in practice more economical than the corresponding attributes sampling plans. It has been shown that it is possible to achieve further savings when EWMA based statistic is used. The design of the recently introduced EWMA statistic based rectifying LTPD variable sampling plans minimizing the mean inspection cost per lot of process average quality is recalled. The measure for assessing the comparative economic efficiency of the plans, which may be used for getting a guidance for selecting the most appropriate type of the sampling plan to be used, is proposed and an evaluation of the economic characteristics of the plans is shown.
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