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st: RE: FWD: poisson regression on aggrgregated data


From   "Kieran McCaul" <kamccaul@meddent.uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: FWD: poisson regression on aggrgregated data
Date   Mon, 9 Feb 2009 04:09:31 +0900

.

It's not clear from this description what you are modelling.  Is it
mortality rates?
Second, when you say that you have used aggregated data, is this data
that you have aggregated or was the data already in aggregated form?



______________________________________________
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) 9224-2140
Fax: (08) 9224 8009
email: kamccaul@meddent.uwa.edu.au
http://myprofile.cos.com/mccaul 
http://www.researcherid.com/rid/B-8751-2008
______________________________________________
The fact that no one understands you doesn't make you an artist.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss
Sent: Sunday, 8 February 2009 7:55 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: FWD: poisson regression on aggrgregated data

<>

Dear [Redacted],

short answer: I do not know! BTW, it is not clear to me why you want to
tap 
only my wisdom when you can have the entire list. So I am forwarding
this 
topic to the list for you...


HTH
Martin
_______________________


Dear Martin

I would like to ask the following question.

I have used poisson regression on aggrgregated data  with 2 covariates
(in a 
cohort of HIV positive pationts)

1.year of starting 3+ antiretroviral treatment (1997, 1998+)
2.time since starting 3+antiretrovirals (0-1, 1-2, 2+)

and I have predicted incident rates in this aggregated data using
predict 
option after the poisson model.

Now my question is if I want to have predicted incident rates for
patints 
starting 3+ arvs at 2000 and time since starting 3+ arvs , 3_4 years
is it correct to use the same predicted incident rate obtained for 
aggregated data and in this example use predicted incident rate for
1998+ 
and 2+?

It would be graitly apreciated if you could answer my question, Please
let 
me know if you would like me to provid more details.

Thank you very much in advance,

Kind regards,
Shell

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