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


From   natasha agarwal <agarwana2@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: estimation with a time trend.
Date   Mon, 5 Jul 2010 17:29:19 +0100

On Mon, Jul 5, 2010 at 5:22 PM, Maarten buis <maartenbuis@yahoo.co.uk> wrote:
> --- 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'.

I will keep in mind and be more careful for introducing the time trend
in the estimation and also be very careful with the reason and
interpretation and the usage of -egen group- command especially that 0
does happen at some point in time.


> -- Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>
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