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Re: st: xi yearly dummies


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xi yearly dummies
Date   Tue, 28 Oct 2008 12:17:52 +0000 (GMT)

--- Chiara Mussida <cmussida@gmail.com> wrote:
> I know that the term homogeneous could be ambiguous. But on the othe
> other hand, it is difficult to find a way of expressing and testing
> the overall concept. Anyway, I will state that my test is a simple
> equality test. But I will try with the interaction between my
> covariates and time to better verify the behaviour of my
> probabilities.

In terms of writing up your paper it can help to distinguish between
the theoretical concept, which can be a bit fuzzy, and the
operationalization, which has to be exact. In your case you have a
theoretical concept homegenous over time, and you operationalized it in
two ways: 1) no interactions and no main effects of time, and 2) no
main effects of time. 

-- 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 N515

+31 20 5986715

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


      
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