RE: SPC Theory question

["DeRoeck, Rich" <RDeRoeck@alphaind.com>]

>>Q:  I have noticed that when the process is stable, XmR, p, np formulas
give
very similar results for the control limits. Does this make sense?<<

For more on this subject can ask SPC Press for their Manuscript No. 123
called BINOMIAL PROPORTIONS on XmR CHARTS. 
www.spcpress.com.

 
Rich DeRoeck
SQE/Alpha Industries.