Something is perfectly correlated with those fixed effects. How large
is your sample, and how large are your panels?
On Fri, Oct 9, 2009 at 4:32 PM, Sue <[email protected]> wrote:
> Dear Statalisters,
>
> I searched for a similar problem but couldn't find anything. After
> splitting the sample into two, I run 4 sets of regressions with the
> same regressors, just adding different fixed effects. Depending on the
> dependent variable, between 1-3 out of the 4 regressions report the
> coefficients but not the standard errors(they are reported as (.) ). I
> use the -areg- command. Any thoughts on what might be causing this?
> There was no such problem before I split the sample. I'd appreciate
> your input.
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--
Stas Kolenikov, also found at http://stas.kolenikov.name
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