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Abstract

This paper investigates the asymptotic validity of the bootstrap for Durbin-Wu-Hausman (DWH) specification tests when instrumental variables (IVs) may be arbitrary weak. It is shown that under strong identification, the bootstrap offers a better approximation than the usual asymptotic 2 distributions. However, the bootstrap provides only a first-order approximation when instruments are weak. These results show unlike theWald-statistic based on a k-class type estimator (Moreira et al., 2009), the bootstrap is valid even for the Wald-type of DWH statistics in the presence of weak instruments.

Item Type:	Report (Discussion Paper)
Authors/Creators:	Doko Tchatoka, F
Keywords:	repec, Specification tests; weak instruments; bootstrap
Publisher:	University of Tasmania
Additional Information:	Discussion Paper 2013-05 Copyright 2013 University of Tasmania
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