Caliendo, Marco; Kopeinig, Sabine - In: Journal of Economic Surveys 22 (2008) 1, pp. 31-72
Propensity score matching (PSM) has become a popular approach to estimate causal treatment effects. It is widely applied when evaluating labour market policies, but empirical examples can be found in very diverse fields of study. Once the researcher has decided to use PSM, he is confronted with...