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Re: st: RE: RE: estimation with a time trend.


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: estimation with a time trend.
Date   Mon, 5 Jul 2010 09:22:22 -0700 (PDT)

--- On Mon, 5/7/10, natasha agarwal wrote:
> The results with the time dummies showed that the
> estimated coefficients on the time dummies was
> increasing over time.
> 
> So I decided to introduce one a time variable like a trend
> which is shown as before.

OK, in your fixed effects model without interactions you 
could just as well have used your original year variable
as it is demeaned anyhow. 

In general, it is good practice to make sure that the value
0 happens at a meaningful point in time, but you should
not use -egen group()- for that, rather you should just
subtract your  'midpoint' or 'reference year'.

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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