Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: Overidentifying restrictions: implications


From   "John A Karikari" <KarikariJ@gao.gov>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Overidentifying restrictions: implications
Date   Fri, 25 Jul 2003 11:20:43 -0400

Please, can someone help me with this issue:
1) What are the "serious" implications (if any) when the Sargan test
(from xtivreg) or the Hansen test (from ivreg2) for overidentifying
restrictions rejects the null that the overidentifying restrictions are
valid, apart from the fact that the structural estimates cannot be
uniquely identified from the reduced form estimates?  
2) Would it be better to "force" identification (by reducing the number
of instruments) even though the instruments are jointly valid. 
Thanks.
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index