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Re: SPC Theory Question
- Subject: Re: SPC Theory Question
- From: John <jsdwd@ksc.th.com>
- Date: Tue, 14 Aug 2001 18:08:30 +0700
- User-Agent: Microsoft Outlook Express Macintosh Edition - 5.01 (1630)
A good discussion of the origin of D4 and the relationship between R and
Sigma is found in Acheson Duncan's book, "Quality Control andIndustrial
Statistics". 4Ed., 1974, Richard Irwin, Inc., ISBN 0-256-01558-9
See Section 3, Chapter 21.
John Dowd
jsdwd@ksc.th.com
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