On Tue, Sep 15, 2009 at 1:17 PM, Johannes Schoder
<[email protected]> wrote:
>
> I found the bug:
>
> Since I am using the following command before the estimation:
> bysort County disease: keep if _n==1
> Stata probably kicks out different obervations eacht time.
> Does someone knows how to avoid that?
Pehaps:
sort county disease, stable
by county disease: keep if _n==1
Scott
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