Introduction a method of determining returns to scale in network data envelopment analysis

Hadi Bagherzadeh Valami; Zeinab Sinaei nasab

Volume 2, Issue 2 , December 2022, , Pages 15-36

https://doi.org/10.22054/jmmf.2023.15184

Abstract
  In the process of evaluating the Decision Making Units, two factors of efficiency and production size can be used. When the production size of a unit is not optimal, its Returns To Scale (RTS) determines that changing the resources in anotherdirection would enhance its productivity. In most previous ...  Read More

Portfolio Selection by a Non-Radial DEA Model; Its application in Tehran Stock Exchange (TSE)

Hadi Bagherzadeh Valami

Volume 1, Issue 2 , December 2021, , Pages 181-194

https://doi.org/10.22054/jmmf.2021.13848

Abstract
  In this paper, considering risks of a portfolio such as mean return, variance of returns, and moments of higher order as output variables including desirable and undesirable outputs, we introduce a non-radial and slack based score to measure efficiency of portfolios. Using the present measure, ranking ...  Read More