Re: st: dropping dummies variables

["ALICE DOBSON" <alice_dobson@hotmail.com>]

Hi Statalisters,
I have a similar problem. The stata command to create a categorical variable 
is xi i.variable
I have some very large categorical variables with around 50 categories
When I use a regression command I drag and drop each category to the command 
line
for instance xtreg sales market1 market2 market 3 .........
In such case I get the estimates
However, when I use the command
xi xtreg sales i.market it just creates the dummies

Best,
Alice





> From: Seb Buechte <sfbuechte@gmail.com>
> Reply-To: statalist@hsphsun2.harvard.edu
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: dropping dummies variables
> Date: Tue, 30 Aug 2005 10:02:55 +0200
>
> Federica,
>
> posting the same mail twice or even three times will not increase the
> number of responses. As I pointed out earlier you may have to post
> some of your code and some of you data, so someone who wants to can
> actually help you.
>
> Kind regards,
> sebastian
>
> On 8/30/05, Federica Demaria <fede.dem@libero.it> wrote:
> > > 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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