Averaging covariate-conditional causal bounds preserves sharpness only when the conditional bounds are uniformly sharp, a condition that fails in several common instrumental-variable DAGs.
Nonparametric bounds on causal effects from partial compliance data
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Adding covariates to bounds: What is the question?
Averaging covariate-conditional causal bounds preserves sharpness only when the conditional bounds are uniformly sharp, a condition that fails in several common instrumental-variable DAGs.