evaluate the performance of decision-making units with network structure by deara method in the presence of fuzzy numbers

Data envelopment analysis is a mathematical technique for evaluating the performance of decision-making units with similar inputs and outputs. traditional dea models do not pay attention to the internal structure of the units and have a black box view, so to solve these problems and consider the internal structure of the units in calculating the efficiency of the network data envelopment analysis model, zadeh also proposed the solution of this problem by introducing z numbers due to the fact that the reliability of the information in the fuzzy set was not well demonstrated. furthermore, we examine the performance by considering the relationships between dea and ra in the presence of fuzzy generalized numbers (z).