FAQ-D: running doctest on docstring of a function

[josef-pkt]

the following is copied from #1810 (comment) but not updated
It still works this way, but currently I'm getting errors from my setup because I have missing names (or import problems because I haven't recompiled statsmodels)

run doctest just for a specific function or method:

import doctest

from statsmodels.regression.linear_model import OLS, OLSResults

doctest.run_docstring_examples(OLSResults.t_test, globals())
doctest.run_docstring_examples(OLSResults.f_test, globals())

doctests fail because of formatting, missing np.squeeze, numeric noise in float numbers
but relatively easy to check correctness by visual inspection.
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