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Re: st: Question on stir


From   Timothy.Mak@iop.kcl.ac.uk
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Question on stir
Date   Mon, 8 Aug 2005 14:24:06 +0100

Thanks Svend, 

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. Why? 

Tim 






"Svend Juul" <SJ@SOCI.AU.DK> 
Sent by: owner-statalist@hsphsun2.harvard.edu
08/08/2005 12:01
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Subject
Re: st: Question on stir






Tim asked:

How can I obtain p-values based on the Incidence Rate Ratio (in stir) 
rather than the exact? 
-------------------------------------------------------------

I think that -ir- and -stir- is the only analysis in Stata where the
"exact mid-P" value is displayed.

You may use -poisson- to obtain a classical P-value and confidence
interval:
  . poisson died smoke , exposure(risktime) irr

Hope this helps
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: +45 8942 6090
Home:  +45 8693 7796
Email: sj@soci.au.dk
__________________________________________ 

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