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Inference in high dimensional panel models with an application to gun control

Authors: Alexandre Belloni , Victor Chernozhukov , Christian Hansen and Damian Kozbur
Date: 15 September 2016
Type: Journal Article, Journal of Business & Economic Statistics, Vol. 34, No. 4, pp. 590--605
DOI: 10.1080/07350015.2015.1102733

Abstract

We consider estimation and inference in panel data models with additive unobserved individual specific heterogeneity in a high-dimensional setting. The setting allows the number of time-varying regressors to be larger than the sample size. To make informative estimation and inference feasible, we require that the overall contribution of the time-varying variables after eliminating the individual specific heterogeneity can be captured by a relatively small number of the available variables whose identities are unknown. This restriction allows the problem of estimation to proceed as a variable selection problem. Importantly, we treat the individual specific heterogeneity as fixed effects which allows this heterogeneity to be related to the observed time-varying variables in an unspecified way and allows that this heterogeneity may differ for all individuals. Within this framework, we provide procedures that give uniformly valid inference over a fixed subset of parameters in the canonical linear fixed effects model and over coefficients on a fixed vector of endogenous variables in panel data instrumental variable models with fixed effects and many instruments. We present simulation results in support of the theoretical developments and illustrate the use of the methods in an application aimed at estimating the effect of gun prevalence on crime rates.

Previous version:
Alexandre Belloni, Victor Chernozhukov, Christian Hansen and Damian Kozbur December 2014, Inference in high dimensional panel models with an application to gun control, cemmap Working Paper, CWP50/14, IFS

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