Measuring the Interval industry cost efficiency score in DEA
Subject Areas : Financial and Economic Modelling
Ghasem
Tohidi
1
(Department of Mathematics, Faculty of Basic Sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran)
Simin
Tohidnia
2
(Department of Mathematics, Faculty of Basic Sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran)
Keywords: Interval data, Data envelopment analysis, Industry cost efficiency,
Abstract :
In this paper we extend the concept of "cost minimizing industry structure" and develop two DEA models for dealing with imprecise data. The main aim of this study is to propose an approach to compute the industry cost efficiency measure in the presence of interval data. We will see that the value obtained by the proposed approach is an interval value. The lower bound and upper bound of the interval industry cost efficiency measure are computed and then decomposed into three components to examine the relationship between them and the lower and upper bounds of the individual interval cost efficiency measures. We also define the cost efficient organization of the industry as a set of DMUs, which minimizes the total cost of producing the interval industry output vector. In fact, this paper determines the optimal number of DMUs and the reallocation of the industry observed outputs among them. We hereby determine the effects of the optimal number of DMUs and the reallocation of outputs among them on the interval industry cost efficiency measure. Finally, a numerical example will be presented to illustrate the proposed approach.
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