One of the important applications of data envelopment analysis (DEA) is estimation of most productive scale size (MPSS). The goal of this study, is to propose a new approach for estimating of MPSS in the presence of uncertain data that only the upper and lower bounds of them are known. To reach...

Non-parametric evaluation of returns to scale of production units in standard DEA models becomes problematic when their underlying technologies involve negative data. The methodology recently offered by Allahyar and Rostamy-Malkhalifeh (2015) (hence after called ARM model) is of some help to...