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RE: st: Trend Test for Rates


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Trend Test for Rates
Date   Thu, 11 Sep 2008 12:35:39 +0100

I agree with Clive. 

Note also that if you find a trend then that will raise questions about
your confidence intervals. In particular, were you using some procedure
that assumed that months were independent of each other? 

Nick 
n.j.cox@durham.ac.uk 

Clive Nicholas

Jason M wrote:

> 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)?

Graphing your data ought to be the very first thing you do before
considering more complex exercises.

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