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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 -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/