结果分析： 由上表可知，其中城市 2，8，9，10 达到了 dea 强有效（松弛变量均为 0），这说明达到了资源充分利用，是一种帕累托最优的状态。 其余决策单元非 dea 有效，需要减少投入. 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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