Assessing Instrumental Variable Relevance:An Alternative Measure and Some Exact Finite Sample Theory

Donald Poskitt and Christopher Skeels

No 862, Department of Economics - Working Papers Series from The University of Melbourne

Abstract: focus on the ability of the instrument set to predict a single endogenous regressor, even if there is more than one endogenous regressor in the equation of interest. We propose new measures of instrument relevance in the presence of multiple endogenous regressors, taking both univariate and multivariate perspectives, and develop the accompanying exact finite sample distribution theory in each case. In passing, the paper also explores relationships that exist between the measures proposed here and other statistics that have been proposed elsewhere in the literature. These explorations highlight the close connection between notions of instrument relevance, identification and specification testing in simultaneous equations models.

Keywords: Instrumental variables; weak instruments; relevance; alienation; Wilks’ Lambda. (search for similar items in EconPapers)
JEL-codes: C12 C13 C16 C30 C51 (search for similar items in EconPapers)
Pages: 26 pages
Date: 2002
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Citations: View citations in EconPapers (10)

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