RE: Shewhart v. Cusum (was den.list-d Digest V2001 #114)

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

Hi,

I have a copy of Wheeler's paper. If anyone is interested I can either fax
or email to you.  Just e-mail me at the address below.

Rich DeRoeck
email:rderoeck@alphaind.com

-----Original Message-----
From: Paul Hollingworth [mailto:PH@paulholl.demon.co.uk]

Ten years ago,  Don Wheeler presented a paper to the ASQC called
'Shewhart's Charts: Myths Facts and Competitors'*. 
Quote:
        "Neither the Cusum plot <with V mask> nor the algebraic Cusum
add anything new. In fact, they do not even provide the insights
available from the XmR chart. <snip> Finally, once the Cusum approach
does signal a change, one must always return to the raw data to actually
make sense of what is happening."

I am pretty sure this paper is still available from SPC Press, but the
topic is also covered in Don's book "Advanced Topics In Statistical
Process Control", which I regard it as essential reading for anyone
looking seriously at the practical application of statistical methods.

Regards
Paul H