Higher order approximations of IV statistics that indicate their properties under weak or many instruments
Frank Kleibergen ()
No 199, Econometric Society 2004 North American Winter Meetings from Econometric Society
We show that the higher order biases of instrumental variable statistics in the strong instrument case indicate the degeneracy of the first order asymptotic distributions of these statistics under weak or many instrument asymptotics. We express the higher order approximations using an estimator of the concentration parameter that is independent of the product of the instruments and the structural errors. The expressions of the higher order approximations of IV statistics whose first order asymptotic distributions are robust to instrument quality remain unaltered under weak and strong instruments. The higher order expressions of IV statistics whose first order asymptotic distributions depend on instrument quality also depend on that
Keywords: weak and many instruments; higher order approximation (search for similar items in EconPapers)
JEL-codes: C11 C20 C30 (search for similar items in EconPapers)
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Persistent link: https://EconPapers.repec.org/RePEc:ecm:nawm04:199
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