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Re: st: Re: sample size calculation


From   Joseph Coveney <jcoveney@bigplanet.com>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Re: sample size calculation
Date   Thu, 30 Sep 2004 17:34:19 +0900

From: Richard Williams wrote:

I think you meant

sampsi 100 110, alpha(0.025) power(0.8) sd1(15) sd2(15)

At least, that is what gives me an N of 43; the original command gives Ns
of 20.

[Excerpted]

----------------------------------------------------------------------------

Yep.  Either that or

-sampsi 100 110, alpha(0.0167) power(0.8) sd1(15) sd2(15)-,

which gives n = 48 for three tests between pairs of the three groups.

Sorry about that, and thanks to Richard for catching it.  (Talk about
peppering with errors . . .)

Joseph Coveney






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