--- Olga Lyashevska <[email protected]> wrote:
> We are trying to use xtmixed as a mixed effect anova taking advantage
> of maximum likelihood estimation.
>
> In xtmixed Stata seems to interprete categorical (cardinal) fixed
> factors (such as colour) as ordinals. How do we get Stata to treat
> these as a simple categorical?
>
> e.g.
>
> xtmixed y colour || individual
>
> where y is dependent continuous variable, colour is
> {red,green,blue}(coded with an integer) and individual is a random
> factor (coded with an integer)
>
> produces output in terms of regression coefficients etc. implying
> that STATA interpreted the categoricals as ordinal variables. As
> though the order was important, but of course it is not for
> categorical.
Have a look at -help xi- or the more flexible -findit xi3-.
Hope this helps,
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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