A Robust Test for Weak Instruments
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We develop a test for weak instruments in linear instrumental variables regression that is robust to heteroscedasticity, autocorrelation, and clustering. Our test statistic is a scaled nonrobust first-stage F statistic. Instruments are considered weak when the two-stage least squares or the limited information maximum likelihood Nagar bias is large relative to a benchmark. We apply our procedures to the estimation of the elasticity of intertemporal substitution, where our test cannot reject the null of weak instruments in a larger number of countries than the test proposed by Stock and Yogo in 2005 Stock, J. and Yogo, M. 2005. “Testing for Weak Instruments In Linear IV Regression,”. In Identification and Inference for Econometric Models: Essays in Honor of Thomas Rothenberg, Edited by: W, D., Andrews, ., J, and, H, . and Stock, . 80–108. Cambridge: Cambridge University Press. [Crossref] , [Google Scholar]. Supplementary materials for this article are available online.