Caliendo, Marco; Kopeinig, Sabine - DIW Berlin (Deutsches Institut für Wirtschaftsforschung) - 2005
to discuss these implementation issues and give some guidance to researchers who want to use PSM for evaluation purposes. … researcher has decided to use PSM, he is confronted with a lot of questions regarding its implementation. To begin with, a first …. Each implementation step involves a lot of decisions and different approaches can be thought of. The aim of this paper is …