The Categorical Instrumental Variable Model: Characterization, Partial Identification, and Statistical Inference
Abstract
We study categorical instrumental variable (IV) models with instrument, treatment, and outcome taking finitely many values. We derive a simple closed-form characterization of the set of joint distributions of potential outcomes that are compatible with a given observed data distribution in terms of a set of inequalities. These inequalities unify several different IV models defined by versions of the independence and exclusion restriction assumptions and are shown to be non-redundant. Finally, given a set of linear functionals of the joint counterfactual distribution, such as pairwise average treatment effects, we construct confidence intervals with simultaneous finite-sample coverage, using a tail bound on the Kullback--Leibler divergence. We illustrate our method using data from the Minneapolis Domestic Violence Experiment.
Cite
@article{arxiv.2405.09510,
title = {The Categorical Instrumental Variable Model: Characterization, Partial Identification, and Statistical Inference},
author = {Yilin Song and F. Richard Guo and K. C. Gary Chan and Thomas S. Richardson},
journal= {arXiv preprint arXiv:2405.09510},
year = {2025}
}
Comments
Full article with revised notations, appendix, and supplementary materials