one of these questions that could have been asked years ago:
The 'hausman' command does a very specific thing, namely test a _pooled_
OLS specification in panel data. In contrast, the better-known Hausman
test of RE vs. FE, and also that of OLS vs. IV/TSLS is automatically
done if applicable.
Why then isn't the Hausman test after pooled OLS done automatically as
well? And related: Why are there no $test and $pvalue accessors after
the 'hausman' command? (At least it's not in the doc.)
My preference would be to deprecate the 'hausman' command, do the test
of the pooled specification automatically, and extend the $hausman
accessor to that case.