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st: RE: Power calculation for McNemar's test


From   "Eamonn O'Brien" <Eamonn.O'Brien@icr.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Power calculation for McNemar's test
Date   Thu, 26 Jan 2006 12:01:49 +0000

Unfortunately I do not think the 'sampsi' command is applicable for
matched pairs.

>>> M.Buis@fsw.vu.nl 26/01/2006 11:47:32 >>>
A -findit power- pointed me to  -sampsi-, won't that do the trick? 
HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z214 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/ 
-----------------------------------------

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Eamonn
O'Brien
Sent: donderdag 26 januari 2006 12:44
To: statalist@hsphsun2.harvard.edu 
Subject: st: Power calculation for McNemar's test

Hi
I am looking for some help with regard to power calculation using
McNemar's test.
I have 2 staining methods 'standard' and 'new' for reading slides. I
have a population consisting of 90 'routine' slides and 20 'abnormal'
slides which will be screened by 35 screeners using both stains. I
wish
to be able to detect a 5% difference in the routine slides and 10%
difference in the 'abnormal'. Does Stata have a routine for this
calculation? As my sample size is fixed I am interested in what are
the
power and significance level scenarios that I can obtain for this
experiment?

   
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