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st: what does lambda mean after treatment regression?


From   [email protected]
To   statalist<[email protected]>
Subject   st: what does lambda mean after treatment regression?
Date   Thu, 25 Jun 2009 18:02:49 +0800

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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