Calibrated Bayesian Inference for Stochastic Intervention Effects

• URL: http://arxiv.org/abs/2608.02924v1
• Date: Mon, 03 Aug 2026 22:20:40 GMT
• Title: Calibrated Bayesian Inference for Stochastic Intervention Effects
• Abstract summary: Causal inference increasingly extends beyond classical causal effects defined by deterministic treatment assignments.<n>Nonparametric Bayesian models are attractive for estimating calibrated intervention effects due to their flexibility and inherent uncertainty propagation.<n>We develop a simple post-processing correction that can be applied to posterior samples without changing the prior or fitting algorithm.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Causal inference increasingly extends beyond classical causal effects defined by deterministic treatment assignments, such as the average treatment effect, to stochastic intervention effects that can weaken positivity requirements and offer greater policy relevance. Nonparametric Bayesian models are attractive for estimating these effects due to their flexibility and inherent uncertainty propagation, but this posterior uncertainty need not be well calibrated for the causal effect of interest. We develop a simple post-processing correction that can be applied to posterior samples without changing the prior or fitting algorithm. We prove that, for a broad class of stochastic interventions, the corrected posterior yields asymptotically efficient inference and credible intervals with asymptotically valid frequentist coverage; formally, it satisfies a semiparametric Bernstein-von Mises theorem. The theory covers interventions specified independently of the observed treatment process, as well as interventions that modify it, including incremental propensity score interventions and a new power-tilt intervention. A central contribution is new theory for SoftBART, including conditions under which this flexible tree-based Bayesian model supports calibrated Bayesian inference for stochastic intervention effects. In simulations, the correction reduces bias and improves coverage relative to the uncorrected Bayesian analysis while remaining competitive with frequentist alternatives. We illustrate the method by estimating how expected LDL cholesterol would change under hypothetical increases or decreases in the odds of receiving statin therapy.

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