Economic characteristics of LTPD sampling plans for inspection by variables

摘要

LTPD sampling plans minimizing mean inspection cost per lot of process average quality when the remainder of rejected lots is inspected were originally designed by Dodge and Romig for inspection by attributes. Plans for inspection by variables and for inspection by variables and attributes (all items from the sample are inspected by variables, remainder of rejected lots is inspected by attributes) were then proposed. Under the same protection of consumer the LTPD plans for inspection by variables are in many situations more economical than the corresponding Dodge-Romig sampling plans for inspection by attributes. Economic characteristics of LTPD plans for inspection by variables and for inspection by variables and attributes are discussed and impact of input parameters values on resulting sampling plan is shown.