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Date:         Wed, 2 Nov 2005 17:55:53 +0000
Reply-To:     toby dunn <tobydunn@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         toby dunn <tobydunn@HOTMAIL.COM>
Subject:      Re: Test - Control Design question - Direct marketing /
              Measurement
Comments: To: davidlcassell@MSN.COM
In-Reply-To:  <BAY103-F12B1FB1B4B9DBE50B435C9B06E0@phx.gbl>
Content-Type: text/plain; format=flowed

O now David, I know or a fact that the Credit industry has bigger problems than simply using random samples. I just wish they would get them solved and get on to the random sample thingy.

Toby Dunn

From: David L Cassell <davidlcassell@MSN.COM> Reply-To: David L Cassell <davidlcassell@MSN.COM> To: SAS-L@LISTSERV.UGA.EDU Subject: Re: Test - Control Design question - Direct marketing / Measurement Date: Wed, 2 Nov 2005 09:49:20 -0800

jonas.bilenas@CHASE.COM sagely replied: >Hard to believe that TEST vs CONTROL designs are still being used as the >standard testing methodology in the consumer credit industry. With the >power of SAS, why hurt yourself by looking at a 2 dimensional view of the >world. > >An excellent quote from J. Stuart Hunter on one factor tests: >“The statistical design of experiments had its origins in the work of Sir >Ronald Fisher… Fisher showed that, by combining the settings of several >factors simultaneously in special arrays (experimental designs), it was >possible to glean information on the separate effects of the several >factors. Experiments in which one factor at a time was varied were shown to >be wasteful and misleading.” > >Source: J. Stuart Hunter (1987). Applying Statistics to Solving Chemical >Problems. Chemtech, 17, 167. > >For an introduction to Experimental Design (Multi Factor Design), check: >www.nesug.org/html/Proceedings/nesug05/an/an1.pdf

What *I* find amazing is that the consumer credit industry has all this information on marketability and they still think that simple random samples are a good thing to do.

David -- David L. Cassell mathematical statistician Design Pathways 3115 NW Norwood Pl. Corvallis OR 97330

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