Ranking in DEA using different efficiency levels

This study proposes a DEA (data envelopment analysis) method based upon using different efficiency levels. Firstly, all efficient DMUs (decision making units) should bedeleted from the original PPS (production possibility set). Then, a new PPS is con-structed based on remaining DMUs which were inefficient already. After that each effi-cient DMU under assessment, will be added to that new PPS solely (it means that thisaddition must be in theabsence of the other efficient DMUs). The alteration caused tothe new PPS and its DMUs would be as a criterion to assess and rank that added efficientone. Two case studies are presented to demonstrate the practically of our proposal.

Keywords:

DEA , Ranking , Efficiency layer