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Re: st: Paired proportions- power calculation


From   "b. water" <barleywater@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Paired proportions- power calculation
Date   Tue, 26 Aug 2003 12:44:46 +0000

Andrew,

I do not know how to do it in Stata. Maybe it can be done (with or without ease), maybe not. In the past when I have to do power calculations on paired proportions - I used a software called power and precision. The manual that comes with the trial version (the 7 days trial version allows for 10 calculations) also included the formulas, which, I supposed, if you are proficient in Stata you can use adapt it to Stata. Here's the link to the trial version of the software:

http://www.poweranalysis.com/

Apologies to other Statalisters for listing or suggesting non-Stata related software. I adopt a pragmatic approach to this issue in my working life. Although I am learning Stata, in the meantime, if I came across a problem that I know can be better handled by other software (perhaps due to my shortcoming in Stata) then I'll used that software in the interim - to save time and effort. Till such time I can use Stata for that problem. Imho. Hope this helps.

cheers,
bw



From: "Andrew McIntosh" <andrew.mcintosh@ed.ac.uk>
Reply-To: statalist@hsphsun2.harvard.edu
To: <statalist@hsphsun2.harvard.edu>
Subject: st: Paired proportions- power calculation
Date: Mon, 25 Aug 2003 21:13:48 +0100

Hello
I (will) have a sample of 30 pairs of people and I want to calculate the

power to detect a difference of 5, 10, or 15 events between the two
(paired ) groups, assuming the control group have an event rate of about
50%.

Unforunately, the 'sampsi' command doesn't seem to extend to matched
pairs and I wondered if there was a method of completing this
analysis using another STATA command? Thank you for any help...

Andrew McIntosh, Edinburgh University





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