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Re: st: Is a simple dummy imputation a valid procedure?


From   Maarten Buis <[email protected]>
To   [email protected]
Subject   Re: st: Is a simple dummy imputation a valid procedure?
Date   Tue, 12 Jul 2011 15:05:19 +0200

On Tue, Jul 12, 2011 at 2:55 PM, Andrea Bennett <[email protected]> wrote:
> To clarify: Will this mean that I also cannot use a dummy for people who answer "don't know"? E.g. asking somebody about the educational background of his parents is difficult for a student. We therefore added a "don't know" field. I thought in this case it is quite ok to add each of the categories individually to the regression (e.g. no_education high_school university dont_know).

Basically the coefficients of your other variables are now a mixture
of the coefficients of those variables while controlling for education
for those observations where education is observed and the effects of
those variables while not controlling for education for those
observations where education is not observed. See:
<http://www.stata.com/statalist/archive/2007-12/msg00030.html>. This
would only make sense when not observed means "does not exist", but
this does not make sense when not observed means "do not know".

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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