A new DEA model to determine the most efficient DMU in presence of weight restrictions, an application in supplier selection problem

In real-life applications of data envelopment analysis (DEA) models, considering weight re- strictions are necessary to prevent ignored or overestimated inputs and outputs in performance evaluation process. Also it is required to consider the viewpoints of decision maker (DM) about the weights of inputs and outputs. In addition, in some cases, DM needs to determine the most efficient decision making unit (DMU). For these purposes, here we propose a new mixed integer linear DEA model to find the most efficient DMU in presence of weight restrictions. The proposed model solves just one model to find the best DMU. The application of the model is indicated by using a real data set of 18 suppliers. The results are compared with standard DEA model (CCR model).