Alireza Amirteimoori - Department of Applied Mathematics, Islamic Azad University, Rasht branch, Rasht, Iran
Sohrab Kordrostami - Department of Applied Mathematics, Islamic Azad University, Lahijan branch, Lahijan, Ira
Pooya nasrollahian - Department of Applied Mathematics, Islamic Azad University, Rasht branch, Rasht, Iran

Using super-efficiency, with regard to ranking efficient units, is increasing in DEA. However, this model has some problems such as the infeasibility. Thus, this article studies infeasibility of the input-based superefficiency model(because of the zero inputs and outputs), and presents a solution by adding virtual DMUs with mean values. Finally, numerical examples are to clarify the subjact matter.

DEA,super-efficiency, infeasibility, mean values