Sensitivity and Stability Radius in Data Envelopment Analysis

One important issue in DEA which has been studied by many DEA researchers is thesensitivity analysis of a specic DMUo, the unit under evaluation.Moreover, we know that in most models of DEA, the best DMUs have the eciency scoreof unity. In some realistic situations, the performance of some inecient DMUs is similarto that of ecient ones.In this paper, we dene a new eciency category, namely; quasi 􀀀 efficient;. Then, wedevelop a procedure for performing a sensitivity analysis of the ecient and quasi-ecientdecision making units.The procedure yields an exact; stability radius; within which data variations will not altera DMU;s classication from ecient or quasi-ecient to inecient status (or vice versa).