Hello Stata members
I'm dealing with a simultaneous equation system, three supply and
three demand equations. As endogeneity is present, a instrumental
variable method is required. I have 37 years of historical data.
I'm in doubt to use 2sls (robust) or 3sls. I know that 3sls is
more efficient than 2sls but because of the small number of
observations it might not be good idea.
3sls doesn't allow the option robust. Is there any way to do so?
when I use reg3 for the whole system together, the results are
different if you I it equation by equation. Anyone know the reason
or which way is more reasonable?
Thanks
Andres
--
Susaeta Larrain,Andres
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