...arrell(1957)提出，后来由Charnes、Cooper和Rhodes(1978)扩展得到基本的CCR模型，用来评价决策单元（Decision Making Unit-DMU）的相对效率（Relative Efficiency），该方法通过线性规划构造一个前沿面，再将决策单元与此前沿面进行对比，得到各单元的相对效率...
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Then the solution of the highest and lowest efficiency score of each decision-making unit (DMU) was discussed. So we can gain an interval efficiency score of each DMU and classify the DMUs.
讨论了DMU的最高效率值和最低效率值的求解，从而确定决策单元（DMU）的区间效率值，并依此对DMU进行分类。
C2R model which was firstly introduced and widely used can decide whether the DMU (Decision Making Unit) come to technological efficiency and scale efficiency at the same time or not.
其最先提出并被广泛应用的C2R模型可同时判断决策单元是否同时满足技术有效和规模有效。
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