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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| 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 <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 -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/