Shaikh, Azeem M.; Simonsen, Marianne; Vytlacil, Edward J.; … - In: Journal of Econometrics 151 (2009) 1, pp. 33-46
Propensity score matching has become a popular method for the estimation of average treatment effects. In empirical applications, researchers almost always impose a parametric model for the propensity score. This practice raises the possibility that the model for the propensity score is...