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Re: st: Question on stir


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Question on stir
Date   Mon, 8 Aug 2005 15:46:04 +0200

Tim wrote,
 
I wonder if I could ask a more theoretical question: I've calculated the 
confidence interval using the Poisson regression method as suggested. The 
confidence intervals were consistently smaller than the ones given by 
stir.
---------------------------------------------
 
-poisson- calculates an approximate (asymptotic) confidence interval, and especially if you have few events there can be some discrepancy between the "exact" interval calculated by -ir- and -stir-, and the result from -poisson-. The exact interval should, I think, be preferred. But you can only obtain it in simple situations, not when more independent variables are involved.
 
Svend

 
________________________________________________________ 
 
Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6 
DK-8000 Aarhus C,  Denmark 
Phone, work:  +45 8942 6090 
Phone, home:  +45 8693 7796 
Fax:          +45 8613 1580 
E-mail:       sj@soci.au.dk 
_________________________________________________________ 

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