A Generalized Model in the Performance Evaluation of Decision Making Sub-units

Data Envelopment Analysis ($DEA$) evaluates the efficiency of decision making units with multiple inputs and outputs. So far, a number of $DEA$ models have been developed: The $CCR$ model, the $BCC$ model and the $FDH$ model are well known as basic $DEA$ models. In many instance, However, the decision making units can be separated into different sub-units. In this paper, we study a generalized model for this $DMUs$ by different sub-units.