st: Non omitted variables with individual fixed effects

[Estrella Gomez <estrellastata@gmail.com>]

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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