Kim, Kyoo Il - In: Econometrics : open access journal 7 (2019) 2/25, pp. 1-13
It is well known that efficient estimation of average treatment effects can be obtained by the method of inverse … estimation to achieve the efficiency. We formalize this argument and further identify the source of the efficiency loss arising … from parametric estimation of the propensity score. We also provide an intuition of why this overfitting is necessary. Our …