Returns to scale of DMUs by interval inputs and outputs in Data Envelopment Analysis (DEA)

Subject Areas : policy making

مهدی فلاح جلودار ¹

1 -  Assistant Professor in Mathematics, Ayatollah Amoli Branch, Islamic Azad, Amol, Iran

Received: 2015-09-08 Accepted : 2015-09-08 Published : 2014-10-01

Keywords: Data Envelopment Analysis, data range, returns to scale,

Abstract :

The basic models of Data Envelopment Analysis (DEA) are designed in such a way that the values of input and output indicators should be identified and known in them. In other words, these models are not used to consider inaccurate, interval, fuzzy, judgment data. In this paper, the aim is to not only review the past researches about the efficiency of the units by interval data and represent their strengths and weaknesses, but also develop a method for determining returns to scale for interval units.