Before revision: Estimation of the policy relevant treatment effects (PRTE)  involves estimation of multiple preliminary parameters, including propensity scores, conditional expectation functions of the outcome and covariates given the propensity score, and marginal treatment effects.
After revision: Estimation of the policy relevant treatment effect (PRTE) involves estimation of multiple preliminary parameters, including propensity scores, conditional expectation functions of the outcome and covariates given the propensity score, and marginal treatment effects.