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


From   Andrea Bennett <mac.stata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Is a simple dummy imputation a valid procedure?
Date   Tue, 12 Jul 2011 15:21:58 +0200

Great help! Many thanks. I definitively will have to look into Stata's <mi> command.

Best,

Andrea


On Jul 12, 2011, at 15:05 , Maarten Buis wrote:

> On Tue, Jul 12, 2011 at 2:55 PM, Andrea Bennett <mac.stata@gmail.com> 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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