Gregg,

You can download the free program G*Power from

http://www.psychologie.uni-trier.de:8000/projects/gpower.html

One of the options is to calculate sample size for a given effect size, alpha level, and power value.

I am not sure if this is the program you had in mind, but it might do what you want.

Paul W. Jeffries Department of Psychology SUNY--Stony Brook Stony Brook NY 11794-2500

On Mon, 17 Aug 1998, Gregg W. Asher wrote:

> Date: Mon, 17 Aug 1998 15:31:36 -0500 > From: "Gregg W. Asher" <gregg.asher@mankato.msus.edu> > To: SPSSX-L@UGA.CC.UGA.EDU > Subject: Sample Size Calculator > Newsgroups: bit.listserv.spssx-l > > Sometime ago, on this list, there was mentioned a program > which help calculate sample size. I got a new computer and > neglected to transfer this program and now find I need it. > The sample size calculator was one of about 4 statistical > utilities in this software program and I believe it was > written by a survey research company. > > Can anyone supply me with the name and URL for this > company? Thanks. > > Gregg Asher > ---------------------- > Gregg W. Asher, Ph.D. > Mankato State University > 321 Maywood > MSU 235 P.O. Box 8400 > Mankato, MN. 56002-8400 > > gregg.asher@mankato.msus.edu >