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Re:st: dropping dummies variables


From   "Federica Demaria" <fede.dem@libero.it>
To   "statalist" <statalist@hsphsun2.harvard.edu>
Subject   Re:st: dropping dummies variables
Date   Tue, 30 Aug 2005 09:57:18 +0200

> Dear all,
> I have a panel of 7 countries, identified by the variable id. When I run the following regression 
> xi: reg y x1 x2 i.year i.id
> as expected, Stata omits the first dummy of both the id and year sets of dummies.
> The strange thing is that it also drops another dummy variable of both the mentioned sets of dummies, but it uses in the estimation the corresponding country and year.
> Could you please help me in understanding the reason behind this dropping?
> thank you in advance
> Federica
> Department of Economics anad Statistics
> University of Calabria
> 
> 
> 
> 
> 
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