=========================================================================
Date:         Tue, 11 Jul 2006 11:15:43 +0800
Reply-To:     Haijie Ding <haijie.ding@gmail.com>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Haijie Ding <haijie.ding@gmail.com>
Subject:      Re: Question on response rate determination simulation
Comments: To: Gene Maguin <emaguin@buffalo.edu>
In-Reply-To:  <000201c6a425$84b77a80$2345cd80@ssw.buffalo.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Dear Gene and Joseph,
Thank you for your kind reply. Yes, we can calculate the sample size based
on the effect size, SD, power. Our question is what's wrong with our
simulation?
Furthermore, is there any way to get the sample size (true/unbiased sample
for the population) without preset the effect size?

Bests,
Haijie

On 7/10/06, Gene Maguin <emaguin@buffalo.edu> wrote:
>
> Haijie,
>
> It seems as if you are working on a power question that is embedded in
> another concern, a concern which I don't quite understand. It seems to me
> that you can get the sample size required for a t-test with a given effect
> size from any of the many power calculators on the web. So suppose you
> knew
> that a sample of 346 was required to given a power of xx for an effect
> size
> of yy, would that answer your questions?
>
> Gene Maguin