From: Stan Hilliard
Date: 07 Oct 2001
Time: 00:38:23
Hi Bart,
YOU SAID: 1. Can we determine acceptance criteria (n and c) based on N (lot size), alfa and AQL [so beta and RQL will be blank).
MY ANSWER: It is not possible to calculate n and c from N, alpha, and AQL. Alpha and AQL specify one point on the oc curve. Lot size adds nothing, as I addressed in an earlier message in this thread.
Said differently, an infinite number of combinations of n and C can produce an infinite number of oc curves that pass through the same (AQL,alpha) point. That's why a second point is necessary to determine a specific n and C.
This should not be discouraging because your purpose should be to protect both the producer against false rejections and the consumer against false acceptances.
TP105 can start with n and C as input and calculate the AQL and RQL. In this option, you also choose the alpha and beta risks.
Stan Hilliard