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st: re: 3sls robust standard error
Thank you for your reply. I have (I think) read
everything there is to read on the _robust command in
the STATA manual and have consulted the User's guide.
The problem is not programming the _robust command but
obtaining the score variable which is needed to obtain
robust estimates. This option is not available after
3sls regression and can apparently only be obtained
with ML programming. Writing a ML program, however, is
very complex for a 3SLS estimation.
And I was looking for some more information on this
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