Date: Wed, 3 Nov 1999 11:21:36 +0100
Reply-To: Jim Groeneveld <J.Groeneveld@ITGROUPS.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Jim Groeneveld <J.Groeneveld@ITGROUPS.COM>
Subject: Re: Sample Size/Power in SAS or somewhere else
Content-Type: text/plain
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
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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
> __________________________________________________
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