4 papers
Difference-in-differences with a mediator
Yuhao Deng, Haoyu Wei, Zhongzhe Ouyang
Causal mediation analysis is a powerful tool for disentangling the total effect of a treatment into its direct effect on the outcome and its indirect effect mediated through an int…
Semiparametric Off-Policy Inference for Optimal Policy Values under Possible Non-Uniqueness
Haoyu Wei
Off-policy evaluation (OPE) constructs confidence intervals for the value of a target policy using data generated under a different behavior policy. Most existing inference methods…
On Efficient Inference of Causal Effects with Multiple Mediators
Haoyu Wei, Hengrui Cai, Chengchun Shi +1
This paper provides robust estimators and efficient inference of causal effects involving multiple interacting mediators. Most existing works either impose a linear model assumptio…
Zero-Inflated Bandits
Haoyu Wei, Runzhe Wan, Lei Shi +1
Many real-world bandit applications are characterized by sparse rewards, which can significantly hinder learning efficiency. Leveraging problem-specific structures for careful dist…