三 效率评价：三阶段 dea 模型 传统的 dea 模型最早由查恩斯（charnes）等提出，运用统计学数据包络的分析方法来评价多投入多产出的效率问题。具体来说，就是将决策单元投影到. Dea 模型具体又可细分为三种类型： (1) ccr 模型：该模型假定 规模报酬不变，主要用来测量技术效率;
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