Estimation of treatment effects with propensity score in the presence of missing outcome data Lead Investigator: Han Feng Institution : Renmin University of China E-Mail : hanfeng1661@163.com Proposal ID : 252 Proposal Description: In the analysis of observational data, missing outcome data often occur. Thus, derivation of the average treatment effects estimators with missing outcome data for causal inference is very important. We want to derive the asymptotic variance based on the missing outcome data under the condition. We also want to verify the correctness of the asymptotic variance via simulation study.