You can download the free program G*Power from
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
Paul W. Jeffries
Department of Psychology
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" <email@example.com>
> 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