Xu, Jin; Zervopoulos, Panagiotis; Qian, Zhenhua; Cheng, Gang - Volkswirtschaftliche Fakultät, … - 2012
The directional distance function model is a generalization of the radial model in data envelopment analysis (DEA). The directional distance function model is appropriate for dealing with cases where undesirable outputs exist. However, it is not a units-invariant measure of efficiency, which...