针对平行结构DEA模型在构造虚拟参考单元时没有考虑任何约束可能存在低估效率的情况,通过加入决策单元的环境属性对现有的平行结构模型进行了改进,从而在组合为虚拟参考单元的子决策单元之间添加必要的约束,使得模型所得的效率值更具现实意义。最后,将改进后的平行结构模型应用于中国各省份污染治理效率评价问题,从实证角度验证了模型的合理性和有效性。
Since parallel models measure the efficiency of DMU without considering the environmental constraint in the selection of reference unit in DEA literature,the evaluation results subject to efficiency underestimation.In this paper,we improve the parallel model by taking into account the environmental attribute of DMUs,which adds practical significance to the obtained efficiency scores.Finally,the proposed model is applied to the efficiency evaluation of pollution control in China to demonstrate the rationality of the model.