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 的前沿面，.
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