从构成生产可能集的观测点集出发,证明了DEA生产可能集的构造、DEA效率值的测算、以及决策单元投影的获得都是由DEA有效单元决定的.进而证明了传统DEA方法选取的评价参考系实际上是所有DEA有效单元.为进一步推广传统DEA方法的参照系给出了理论准备.
By the set of observation points included in a production possibility sets,it is proved that the structure of DEA production possibility sets,the size of DEA efficient values and the projection of decision-making units can be determined by the DEA efficient units.Further,it is proved that reference systems of traditional DEA method are all the DEA efficient units.The results are helpful to generalize reference systems of traditional DEA method.