A Guzali - Department of Mathematics, Ahar Branch, Islamic Azad University, Ahar , Iran
J Janafian - Department of Applied Mathematics, Faculty of Mathematical Sciences, University of Tabriz, Tabriz, Iran

Data envelopment analysis (DEA) has been proved to be an excellent approach for measuring performance of decision making units (DMUs) that use multiple inputs to generate multiple outputs. In many real world scenarios, inputs or outputs may be shared among various activities. This paper proposes a two-stage DEA model with additional input in the second stage and part of intermediate products as final output. We first discuss the non-cooperative condition in order to determine the upper and lower bounds of the efficiencies of sub-DMUs in different stages. A parametric transformation is described to solve the non-linear programming of the overall cooperative efficiency model. Moreover, we have added our results by suing simulation based on the new application that confirm the obtained results in this paper is compatible.

Data Envelopment Analysis, Sheared flow, Two-stage DEA, Game efficiency