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Simultaneous confidence intervals for high-dimensional linear models with many endogenous variables

Authors: Alexandre Belloni , Victor Chernozhukov , Christian Hansen and Whitney K. Newey
Date: 21 December 2017
Type: cemmap Working Paper, CWP63/17
DOI: 10.1920/wp.cem.2017.6317

Abstract

High-dimensional linear models with endogenous variables play an increasingly important role in recent econometric literature. In this work we allow for models with many endogenous variables and many instrument variables to achieve identification. Because of the high-dimensionality in the second stage, constructing honest confidence regions with asymptotically correct coverage is non-trivial. Our main contribution is to propose estimators and confidence regions that would achieve that.
The approach relies on moment conditions that have an additional orthogonal property with respect to nuisance parameters. Moreover, estimation of high-dimension nuisance parameters is carried out via new pivotal procedures. In order to achieve simultaneously valid confidence regions we use a multiplier bootstrap procedure to compute critical values and establish its validity.

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