Propensity score estimators for the average treatment effect and the average treatment effect on the treated may yield very different estimates

Conclusion Although both approaches are recommended as valid methods for causal inference, propensity score-matching for ATT and inverse probability of treatment weighting for average treatment effect yield substantially different estimates of treatment effect. The choice of the estimand should drive the choice of the method.

http://smm.sagepub.com/cgi/content/abstract/25/5/1938?rss=1

Source: Statistical Methods in Medical Research - October 1, 2016 Category: Statistics Authors: Pirracchio, R., Carone, M., Rigon, M. R., Caruana, E., Mebazaa, A., Chevret, S. Tags: Articles Source Type: research