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Heather L. Bednarek and Hailong Qian
 
''The optimality of non-optimal GMM estimation of parameters of interest and the partial asymptotic efficiency of 2SLS estimation''
( 2016, Vol. 36 No.3 )
 
 
In this paper, we first derive a necessary and sufficient condition for generalized method of moments (GMM) estimation of a subset of parameters using a non-optimal weighting matrix to be asymptotically as efficient as the optimal GMM estimation. We then apply our result to simultaneous equations models and derive a necessary and sufficient condition for 2SLS estimation of a subset of regression coefficients to be asymptotically as efficient as the 3SLS estimation applied to the whole system. Our condition for the partial asymptotic efficiency of 2SLS estimation encompasses many existing results for the numerical equality of 2SLS and 3SLS estimation of all regression coefficients.
 
 
Keywords: GMM estimation, Parameters of interest, Partial asymptotic efficiency, 2SLS estimation, 3SLS estimation, simultaneous equations models
JEL: C1 - Econometric and Statistical Methods: General
C3 - Cross-Sectional Models; Spatial Models; Treatment Effect Models; Quantile Regressions
 
Manuscript Received : Nov 12 2015 Manuscript Accepted : Aug 24 2016

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