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Re: st: dropping dummies variables


From   "ALICE DOBSON" <alice_dobson@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: dropping dummies variables
Date   Tue, 30 Aug 2005 08:03:43 -0400

YOU WERE SO RIGHT! THANKS


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 13:49:14 +0200

It looks like your missing out the " : " after the xi. It should read:

xi: regress y i.dummy

where dummy is your categorical variable.

Sebastian

On 8/30/05, ALICE DOBSON <alice_dobson@hotmail.com> wrote:
> 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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>


--
- Seb F Buechte
-
- Stay tuned!

*
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_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/




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