Dehejia, Rajeev H.; Wahba, Sadek - 2012
This paper considers causal inference and sample selection bias in non-experimental settings in which: (i) few units in … pretreatment characteristics. We discuss the use of propensity score matching methods, and implement them using data from the NSW … comparison units comparable to the treated units and, hence, in alleviating the bias due to systematic differences between the …