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st: RE: Trend Test for Rates


From   "Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Trend Test for Rates
Date   Thu, 11 Sep 2008 09:49:38 -0700

Rather than looking at 'proportions', you might consider doing a
log-linear regression on the number of events using the denominators as
offsets.  This will also allow covariates.  The command glm will do
this, or you can use the poisson command.

Tony

Peter A. Lachenbruch
Department of Public Health
Oregon State University
Corvallis, OR 97330
Phone: 541-737-3832
FAX: 541-737-4001


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of
jasonm@ucla.edu
Sent: Wednesday, September 10, 2008 9:04 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Trend Test for Rates

I would like to see if there is any kind of trend over a 12 month
period.
I have rates (injuries/time) and their accompanying confidence  
intervals for each of the 12 months (ie 12 rates).
Would vwls be a good approach to look for a trend? Does vwls have any  
kind of eform option for the coefficients (since I took the log of all  
the variables)?

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