SAS macro UNIFYPOW is available at http://www.bio.ri.ccf.org/power.html. UnifyPow.sas, version 98.08.25 1998 Copyright (c) by Ralph G. O'Brien, PhD Department of Biostatistics and Epidemiology Cleveland Clinic Foundation Cleveland, OH 44195 Voice: 216-445-9451 Fax: 216-444-8023 robrien@bio.ri.ccf.org

* * * *-------------------------------------------------------------------*

SAS macro FPOWER is available at http://www.math.yorku.ca/SCS/sasmac/fpower.html. Author: Michael Friendly <FRIENDLY@YorkU.CA> After : AJL Cary, Syntex Research; from: SAS SUGI, 1983 Created: 14 Mar 1990 11:16:28 Revised: 24 Mar 1995 21:06:48 Version: 1.2

If you can't find them there, give me a call and I will send them to you. Both yet untested by me, I only tested some other stand-alone power/sample size software. If you use/test these or other concerning SAS macros, please report your experience, judgments, critics on these to SAS-L (or to me at least). There are several comprehensive reviews on the internet indicating sites with articles and software for power and sample size. Search for "statistical power" and "sample size". I don't know them by head, I've got them at home.

Regards - Jim. -- Y. Groeneveld, MSc IMRO TRAMARKO tel. +31 412 407 070 senior statistician P.O. Box 1 fax. +31 412 407 080 5350 AA BERGHEM IMRO TRAMARKO: a CRO J.Groeneveld@ITGroups.com the Netherlands in clinical research

"My job is to keep my computer working." - Jim Groeneveld

> -----Original Message----- > From: Stephen Arthur [SMTP:sarthur67@YAHOO.COM] > Sent: Tuesday, November 02, 1999 3:42 AM > To: SAS-L@LISTSERV.UGA.EDU > Subject: Sample Size/Power in SAS or somewhere else > > Dear list, > > I have an open (non-specific, sloppy, you might call > it) SAS and statistics related question. > > I am interested if anyone has information about > calculating proper sample sizes and/or power for > biological scientific experiments. Its been almost a > year and a half since I passed my stats qualifying > exam in grad school, so I'd like a little refresher so > I can try out an application. Maybe you could refer > me to a statistics book (or another stats discussion > group). To my recollection, SAS does not supply a > PROC to calculate sample size and/or power, but I > remember in Grad School using another program that > calculated the sample size for t-tests or some other > statistical application, but can't remember the name > of it. > > Tonight, I am going to have a look at my intro stats > book, because I remember there being listed some > formulas for a "population" application. The type of > data I am working with is NOT clinical trial data but > physical measurements, such as temperature, mass, > chemical sequence if that clarifies my inquiry or > makes it more interesting for some. > > steve > __________________________________________________ > Do You Yahoo!? > Bid and sell for free at http://auctions.yahoo.com