Inference with Many Weak Instruments and Heterogeneity

Fuente: arXiv
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Main Author: Yap, Luther
Format: Preprint
Published: 2024
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author Yap, Luther
author_facet Yap, Luther
contents This paper considers inference in a linear instrumental variable regression model with many potentially weak instruments, in the presence of heterogeneous treatment effects. I first show that existing test procedures, including those that are robust to either weak instruments or heterogeneous treatment effects, can be arbitrarily oversized. I propose a novel and valid test based on a score statistic and a ``leave-three-out" variance estimator. In the presence of heterogeneity and within the class of tests that are functions of the leave-one-out analog of a maximal invariant, this test is asymptotically the uniformly most powerful unbiased test. In two applications to judge and quarter-of-birth instruments, the proposed inference procedure also yields a bounded confidence set while some existing methods yield unbounded or empty confidence sets.
format Preprint
id arxiv_https___arxiv_org_abs_2408_11193
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Inference with Many Weak Instruments and Heterogeneity
Yap, Luther
Econometrics
This paper considers inference in a linear instrumental variable regression model with many potentially weak instruments, in the presence of heterogeneous treatment effects. I first show that existing test procedures, including those that are robust to either weak instruments or heterogeneous treatment effects, can be arbitrarily oversized. I propose a novel and valid test based on a score statistic and a ``leave-three-out" variance estimator. In the presence of heterogeneity and within the class of tests that are functions of the leave-one-out analog of a maximal invariant, this test is asymptotically the uniformly most powerful unbiased test. In two applications to judge and quarter-of-birth instruments, the proposed inference procedure also yields a bounded confidence set while some existing methods yield unbounded or empty confidence sets.
title Inference with Many Weak Instruments and Heterogeneity
topic Econometrics
url https://arxiv.org/abs/2408.11193