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Re: Software & Sample Size

From: Stan Hilliard
Date: 07 Oct 2001
Time: 00:38:23

Comments

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


Last changed: November 20, 2007