Hi Suzy,
the xi indcatvargenerates dummies for each category. Since you did not use
the nocons option, one dummy has to be dropped. Otherwise the dummies were
perfectly collinear with the constant, since they add up to unity. So
everything is correct and the coefficient on _I_indcatvar should be
interpreted relative to the dummy-base.
Hans
[email protected] schrieb am 11/07/2005 14:30:20:
> Dear Statamembers,
>
> I have a categorical variable, coded as 0, 1, 2.
>
> When I do a a simple regression equation using "xi: regress depvar,
> indcontvar, i.indcatvar, "
>
> Stata drops the category 2 (n=40/1196)
>
> I have other categorical variables in the model, but everything else
> looks OK.
>
> I have no idea why it's being dropped.
>
> thanks for any insight.
> Suzy
> *
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>
*
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