Dehnad, Khosrow (1988, ASQC) AT&T Bell Labs, Holmdel, NJ
Average Outgoing Quality (AOQ) of lots that are "ready to ship" has traditionally been estimated from an audit, i.e., a sample from these lots. When AOQ is less than a few hundred parts per million (PPM), the required sample size is impractically large. In such a case, a practical alternative is to use final inspection data instead of an audit. The question of using the final inspection data to estimate AOQ and some caveats concerning that use are considered. A procedure for constructing an upper bound for AOQ is given; and the case for using variable data instead of attribute data is presented.
Inspection,Average Outgoing Quality (AOQ),Sampling,Parts per million (ppm)