The exact distribution of the conditional likelihood-ratio test in instrumental variables regression

Malte Londschien

Papers from arXiv.org

Abstract: We derive the exact asymptotic distribution of the conditional likelihood-ratio test in instrumental variables regression under weak instrument asymptotics and for multiple endogenous variables. The distribution is conditional on all eigenvalues of the concentration matrix, rather than only the smallest eigenvalue as in an existing asymptotic upper bound. This exact characterization leads to a substantially more powerful test if there are differently identified endogenous variables. We provide computational methods implementing the test and demonstrate the power gains through numerical analysis.

Date: 2025-09, Revised 2025-09
New Economics Papers: this item is included in nep-ecm
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