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st: RE: Sample size


From   VISINTAINER PAUL <VISINT@NYMC.EDU>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Sample size
Date   Mon, 28 Apr 2003 12:15:50 -0400

By the way, to add to my last email, I just recalled that there was an
article by Glen Satten and Lawrence Kupper that provided sample size
estimates based on interval estimation of the odds ratio.  Here is the
reference:

Satten GA, Kupper LL. Sample size requirements for interval estimation of
the odds ratio. Am J Epid, 1990; 131: 177-184.

I suppose the limits could be transformed to represent proportions rather
than odds.

Paul

-----Original Message-----
From: Don Spady [mailto:dspady@ualberta.ca] 
Sent: Monday, April 28, 2003 11:19 AM
To: Statalist
Subject: st: Sample size

Dear all
  I sent this before but got no response.  I have revised it.
I want to estimate the sample size needed to detect an disease that
occurs in 1 out of 1000 people (as an example).   The alternate
state is absence of disease which would occur in 999 of 1000 people on
average.   The problem is that I get numbers but I don't know if they
are the
right ones.  Can I use sampsi grp1 being those with disease and Grp2
being
those without disease.  Or do I use sampsi   0.001, onesample as in:

sampsi 0.001 0, p(0.8) onesample

I need help and thank in advance those that provide it.

Donald Spady
Dep't of Pediatrics, University of Alberta
(780) 407-1244

Nature has no reset button.

Donald Spady
Dep't of Pediatrics, University of Alberta
(780) 407-1244

Nature has no reset button.


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