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st:Bundell and Blond: Sargan Test


From   Michelena, Gabriel Nicol s <hmg@mrecic.gov.ar>
To   <statalist@hsphsun2.harvard.edu>
Subject   st:Bundell and Blond: Sargan Test
Date   Wed, 5 Jan 2011 12:40:57 -0300

Dear Stata List,

I have a panel data model of international trade, and im regressing the
quantity of imports, for a set of products, using as regressors numbers of
importers, number of exportes, trend, etc.

I´ve estimated the model using POLS, Fixed Effects and GMM (Arellano Bond
and Bundell Blond). The problem that I found is that ar(1) and ar(2) test
perform well, but I reject always the Sargan Test. 

What did you recommend? Forget GMM and use Fixed Effects? 

---

Lic. Gabriel Michelena

Centro de Economía Internacional. Ministerio de Relaciones Exteriores,
Comercio Internacional y Culto Esmeralda 1212 - 2° Piso - Oficina 201 Ciudad
Autónoma de Buenos Aires

(C1007ABR) Argentina

Tel: (+5411) 4819-7000. Interno 7485

Fax: (+5411) 4819-7484

URL: http://www.cei.gob.ar/

E-mail: hmg@mrecic.gov.ar

 


-----Mensaje original-----
De: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] En nombre de Ye, Jingjing
Enviado el: Wednesday, January 05, 2011 11:36 AM
Para: statalist@hsphsun2.harvard.edu
Asunto: st: weak-instrument-robust tests in ivreg2

Dear statalist,
I have a cross-sectional data, and three endogenous variables (one of them
is an interaction term of the other two: exogamy, emp_ratio, interation),
three instruments(also generate interaction using the three exclusion
restriction. I want to do weak-instrument-robust, however, I got
inconsistent results from Anderson-Rubin wald/F statistic and  Stock-Wright
LM test.


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