Available online at http://ijdea.srbiau.ac.ir Int. J. Data Envelopment Analysis (ISSN 2345-458X) Vol.7, No.1, Year 2019 Article ID IJDEA-00422, 12 pages Research Article Evaluating the Efficiency of Bank Branches with Random Data M. Ghashami 1 , F. Hossinzadeh Lotfi *2 (1,2) Department of Mathematics, University of Science and Research, Iran, Tehran Received 04 May 2018, Accepted 16 November 2018 Abstract Data Envelopment Analysis (DEA) is a mathematic technique to evaluate the relative efficiency of a group of homogeneous decision making units (DMUs) with multiple inputs and outputs. The efficiency of each unit is measured based on its distance to the production possibility set (PPS). [5] (Barberis, N. & Thaler) In this paper, the BCC model is used in output-oriented. The average return on profit as output and the covariance of profit (risk) are considered as inputs. In the continuation, the median and the mod earned investment as two factors of output to the model presented to provide a better analysis of the types of investment, and finally, let us mention a true example. Keywords: Data Envelopment Analysis (DEA), Stock Portfolio, Model Orientation, Average Variance, Risk. *. Corresponding author: Email: farhad@hosseinzadeh.ir International Journal of Data Envelopment Analysis Science and Research Branch (IAU)