Causal inference with ordinal outcomes: copula-based identification, estimation and sensitivity analysis

TL;DR

This paper introduces a copula-based approach for causal inference with ordinal outcomes, enabling point estimation and sensitivity analysis by linking marginal distributions through a parametric copula.

Contribution

It develops a novel copula-based method that identifies causal estimands under unconfoundedness and provides a sensitivity analysis framework for copula and unconfoundedness assumptions.

Findings

The proposed estimators are rate-doubly-robust and efficient.

Sensitivity curves typically lie within sharp bounds.

An R package 'ordinalCI' is developed for implementation.

Abstract

In causal inference with ordinal outcomes, several interpretable estimands are functions of the probability that the potential outcome under one treatment is larger than that under another treatment for the same unit. This probability depends on the joint distribution of both potential outcomes and is generally not identifiable. Existing work has focused on sharp bounds of this probability based on partial identification, but bounds are often too wide to be informative. We propose a copula-based method that links the identifiable marginal distributions of the potential outcomes via a parametric copula, treating the copula association parameter as a sensitivity parameter. With a fixed copula parameter, the estimands become identified functionals of the observed data. Working under unconfoundedness, we derive the efficient influence function in the nonparametric model and construct one-step estimators that accommodate flexible nuisance estimation. The resulting procedure is rate-doubly-robust and attains the semiparametric efficiency bound under standard conditions. Varying the copula parameter yields a sensitivity curve with point-wise confidence bands that typically lie within the sharp bounds, providing an interpretable bridge between partial identification and point estimation. We further provide a comprehensive sensitivity analysis with respect to both the copula specification and the unconfoundedness assumption. We develop an associated R package \texttt{ordinalCI}.