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Re: Cpk and Sample Size/frequency determination

From: nick viney @ nviney@kangan.edu.au
Date: 08 Feb 2001
Time: 20:48:38

Comments

Hello stan, thank you for your reply.

I hope to apply some method of reducing sampling intervals or quanities on existing processes for variables. It doesn't have to be any manufacting process in particular as long as the method used gives a realistic level of inspection based on process performance.

Since posting this request I've found several intersting articles that I beleive that address this issue. In particular,

- Sample size determination for lower confidence intervals for estimating process capability; Computers and Industrial engineering 36 (1999 pp 603-614)

One thing that seems to be repeated among a lot of the articles is that there is still a lot of concern about the assumptions made when performing process capability analysis. Normality, the effects of certain distributins, variation in measurement system and sampling system and the correct method to turn a non-normal process into normal.

Do you know of this approach suggested in this article?

Am I on the right path?

Regards.


Last changed: November 20, 2007