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ADMISSIBLE INVARIANT SIMILAR TESTS FORINSTRUMENTAL VARIABLES REGRESSION

Published online by Cambridge University Press:  01 June 2009

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Abstract

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This paper studies a model widely used in the weakinstruments literature and establishes admissibilityof the weighted average power likelihood ratio testsrecently derived by Andrews, Moreira, and Stock(2004, NBER Technical Working Paper 199). The classof tests covered by this admissibility resultcontains the Anderson and Rubin (1949,Annals of Mathematical Statistics20, 46–63) test. Thus, there is no conventionalstatistical sense in which the Anderson and Rubin(1949) test “wastes degrees of freedom.” Inaddition, it is shown that the test proposed byMoreira (2003, Econometrica 71,1027–1048) belongs to the closure of (i.e., can beinterpreted as a limiting case of) the class oftests covered by our admissibility result.

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Type
Research Article
Copyright
Copyright © Cambridge University Press 2009