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AW: st: Industry dummies - inflated standard errors


From   "Seliger Florian" <seliger@kof.ethz.ch>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   AW: st: Industry dummies - inflated standard errors
Date   Mon, 9 Jul 2012 15:00:15 +0000

It seems that I chose an unfortunate reference category.
Thanks.




-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Maarten Buis
Gesendet: Montag, 9. Juli 2012 16:47
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: Industry dummies - inflated standard errors

On Mon, Jul 9, 2012 at 4:38 PM, Seliger  Florian wrote:
> Using factor variables solves the problem.
> However, I don't understand why? What is the difference between using dummy_1-dummy_33 and i.dummy?

It could mean that you did not exclude the reference category from dummy_1-dummy_33, or that you chose an unfortunate reference category, or that you made an error while creating those indicator variables.

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
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