【摘要】 ＤＥＡ有效是数据包络分析最重要的概念之一，ＤＥＡ有效单元与偏序集的极大元之间具有紧密的关系．从偏序集的理论出发，刻画了ＤＥＡ有效单元的本质特征，给出了变换不变性的一个充要条件．同时将ＤＥＡ有效的定义拓广到偏序集上，给出了ＳＥＡ有效的概念，并得到了一些相关性质．更多还原

【Abstract】 DEA efficiency is an important conception in data envelopment analysis, it has close relationship between efficient units and maximum elements. On the basis of theory of partial ordering, this paper gives a characterization of the effective units in DEA and a necessary and sufficient condition for translation invariance. At the same time, the method of structure envelopment analysis is provided.更多还原