【摘要】 本文首先讨论ＤＥＡ相对效率指数及其对投入产出松驰量的处理方法。然后建立了判断ＤＥＡ有效决策单元的又一数学规划模型，并相应给出了决策单元ＤＥＡ有效的充要条件。最后依据所定义的平均横切效率指标，提出了一种新的ＤＥＡ有效决策单元排序方法更多还原

【Abstract】 This paper further examines the expression of the efficiency index in Data Envelopment Analysis (DEA) as well as the slacks in factor (input and output). Furthermore, it also introduces a new mathematical programming without the conventional Non-Archimedian infinite number ε for identifying efficient Decision-Making Units (DMUs). In addition, by virtue of the defined average cross-efficiency concept a new approach is suggested to rank the DMUs having been identified effecient.更多还原