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Re: SPC Theory Question



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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