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Re: st: Non omitted variables with individual fixed effects
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Non omitted variables with individual fixed effects
Date
Fri, 29 Nov 2013 11:10:35 +0000
Would you expect Stata to drop a predictor that is an indicator
variable because it is constant within groups?
I don't think we can comment otherwise on whether the model is
correctly specified. Even economists would have to guess hard to work
out what your variables are.
Nick
[email protected]
On 29 November 2013 11:01, Estrella Gomez <[email protected]> wrote:
> Dear statalisters
>
> I am running a regression on a cross section basis. I use country
> specific fixed effects and, at the same time, I introduce country
> specific variables in the regression:
>
> xi: reg logCBT log_dist comlang_off gdp_part i.part i.decl , robust
>
> where decl and part are the variables identifying partner and
> declarant countries, and gdp_part is the GDP of the partner
>
> My question is: why is gdp_part not excluded? This variable is
> constant for the partner and I was expecting Stata to drop it. Is the
> command incorrectly specified?
>
> Thanks a lot,
> Estrella
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