In this paper we discuss the structure on the DMU set of DEA efficiency about C2R and C2W models, and obtain some theoretical results. These results are of important significance in practice.

• 本文对C~2R和C~2W模型下的DEA有效决策单元集合在结构上进行了一定探讨,得到了一些理论上新的结果,具有一定的实际意义。