Date:         Thu, 31 Aug 2006 08:59:25 -0400
Reply-To:     Peter Flom <Flom@NDRI.ORG>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Peter Flom <Flom@NDRI.ORG>
Subject:      Re: Power Analysis
Comments: To: Sam Roberts <learnsassam@YAHOO.COM>
In-Reply-To:  <200608311126.k7VAkj09019516@mailgw.cc.uga.edu>
Content-Type: text/plain; charset=US-ASCII

>>> Sam Roberts <learnsassam@YAHOO.COM> 8/31/2006 7:26 am >>> wrote
<<<
    I am trying to do some power analysis for my study. I have
repeated
measures for 3 time points and the outcome is continuous. I was
wondering if there is any SAS routine to perform power analysis for
repeated measures.
>>>

Unless it was added in the last few months, I am fairly sure the answer
is NO.  I've talked with the folks at SAS about this, and they are
pursuing it, but it's a very complex area.

The (commercial)  program PASS by Hintze does do some of this, but it
requires estimates of many things that one is unlikely to know before
doing a study.

Tom Snijders has also written about this, and has a free program called
PINT.  It's limited in what it does, from what I can tell.  He's also
written summaries of what is known about this, including a fairly recent
one.

If googling on his name doesn't work, I can probably dig up the
references.

HTH

Peter




Peter L. Flom, PhD
Assistant Director, Statistics and Data Analysis Core
Center for Drug Use and HIV Research
National Development and Research Institutes
71 W. 23rd St
http://cduhr.ndri.org
www.peterflom.com
New York, NY 10010
(212) 845-4485 (voice)
(917) 438-0894 (fax)