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Re: st: problem with mvprobit


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: problem with mvprobit
Date   Mon, 19 Nov 2007 15:19:19 +0000 (GMT)

--- Georg Metzger <Metzger@zew.de> wrote:
> The problem is following:
> I want to analyze the effect of experience and have three experience
> types, namely no experience, good experience and bad experience. The
> good experience variable is the mentioned variable that predicts the
> outcome perfectly. I think if I drop this variable it would bias the
> result concerning the bad experience measure since the basis category
> is not solely "no experience" anymore but "no experience and good
> experience", right?

Depends on your reference category, but if you chose "no experience" as
the reference, and also excluded "good experience" than that changes
the interpretation. I would not say it is biased, it now compares "bad
experience" versus "absence of bad experience", which can be
meaningfull too.

-- Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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