Ranking Models in Data Envelopment Analysis Technique
Data envelopment analysis as a mathematical technique formulated based on linear programming problems which enables decision makers to evaluate Decision-Making Units (DMUs) with multiple inputs and outputs. One of the important issue in DEA technique which is widely discussed by researchers is ranking efficient units. Since these units are not comparable among each other. Ranking DMUs is an important issue in theory and practice and many applications in this field are performed. Considering the ranking order senior managers try to better guiding the system. In literature there exist different ranking models each of which tries to make improvements in this subject. Many researchers try to make advances in theory of ranking units and overcome the difficulties exist in presented methods. Each of the existing ranking method has its own specialties and advantages. As each of the existing method can be viewed from different aspects, it is possible that somewhat these groups have overlapping with the others.