ENH: Add Hausman specification test#249

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eirki wants to merge 9 commits intobashtage:mainfrom

eirki:hausman_specification_test

Commits on Feb 27, 2020

Commits on Feb 28, 2020

Commits on Mar 9, 2020

Wu-Hausman: Remove sqrt warning assertion from test
eirki
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Commits on Apr 28, 2020