在此基础上提出了基于样本评价组合有效性的综合模型，并根据生产函数理论讨论了这一模型的意义。

Then the author offers a synthetical model based on sample evaluation combination efficiency and discusses the meaning of this model according to produce function theory.

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基于样本的DEA方法在择优排序，风险评估，分析有效单元性质，预测组合有效性等方面具有积极的作用。

The sample DEA has an active function on giving an order of units, risk evaluation, analyzing of DEA efficient units and forecasting the combination efficiency of some units.

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第一，存在项目组合管理机制有效性的质量控制和测量。

First, there are controls and measures that qualify that the portfolio management governance mechanism is effective.

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