I use -treatment- in the stata, and the resulting lambda is insignificant.
What does it mean? Does it mean the self-selection is not serious?
Does it mean the dummy variable is exogenous?
Which result then should I take, the OLS result or the treatment result?
Another question is what difference between hausman test and -treatment-
when testing whether a dummy variable is endogenous. If hausman test shows
the dummy variable is endogenous, is it necessary the resulting lambda of -treatment-
is significant?
Sincerely,
from Rose.
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