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| From | Nick Cox <njcoxstata@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| 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 njcoxstata@gmail.com On 29 November 2013 11:01, Estrella Gomez <estrellastata@gmail.com> 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 > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/