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st: RE: Help needed for Poisson regression

From   "Kieran McCaul" <>
To   <>
Subject   st: RE: Help needed for Poisson regression
Date   Thu, 27 Aug 2009 07:07:40 +0800


You have to provide more information about what you are trying to do.

If you have case-control data, I can't see how you can use Poisson
regression to analyse it.  Poisson regression is used for the analysis
of cohort data.

Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2701
Fax: (08) 9224 8009
If you live to be one hundred, you've got it made.
Very few people die past that age - George Burns

-----Original Message-----
[] On Behalf Of priyajit
Sent: Wednesday, 26 August 2009 10:55 AM
Subject: st: Help needed for Poisson regresion

Can anyone help me clarify the doubt regarding the coding pattern. I am
trying to run a Poisson regression with Incidence rate Ratio for
diarrhea for a CASE and CONTROL study.

Earlier I put code 1 for the CASE and 2 for CONTROL. Later I changed the
code as 1 for CASE and 0 for CONTROL. Due to this I saw the change in
the results. Can anyone suggest me what is the correct way of assigning
codes to the dependent and independent variable.

any reference for interpretation of the results will be mush helpful.
Please Cc the response to my email ID also as I am not sure if my email
ID is still included under the forum.



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