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:[email protected]]
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.
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
