## Journal of Applied Mathematics

### Ranking DMUs by Calculating the Interval Efficiency with a Common Set of Weights in DEA

#### Abstract

To evaluate the performance of decision making units (DMUs), data envelopment analysis (DEA) was introduced. Basically, the traditional DEA scheme calculates the best relative efficiency score (i.e., the “optimistic” efficiency) of each DMU with the most favorable weights. A decision maker may be unable to compare and fully rank the efficiencies of different DMUs that are calculated using these potentially distinct sets of weights on the same basis. Based on the literature, the assignable worst relative efficiency score (i.e., the “pessimistic” efficiency) for each DMU can also be determined. In this paper, the best and the worst relative efficiencies are considered simultaneously. To measure the overall performance of the DMUs, an integration of both the best and the worst relative efficiencies is considered in the form of an interval. The advantage of this efficiency interval is that it provides all of the possible efficiency values and an expanded overview to the decision maker. The proposed method determines the lower- and upper-bounds of the interval efficiency over a common set of weights. To demonstrate the implementation of the introduced method, a numerical example is provided.

#### Article information

Source
J. Appl. Math., Volume 2014 (2014), Article ID 346763, 9 pages.

Dates
First available in Project Euclid: 2 March 2015

Permanent link to this document
https://projecteuclid.org/euclid.jam/1425305805

Digital Object Identifier
doi:10.1155/2014/346763

Mathematical Reviews number (MathSciNet)
MR3219419

#### Citation

Rezaie, Vahideh; Ahmad, Tahir; Awang, Siti-Rahmah; Khanmohammadi, Masumeh; Maan, Normah. Ranking DMUs by Calculating the Interval Efficiency with a Common Set of Weights in DEA. J. Appl. Math. 2014 (2014), Article ID 346763, 9 pages. doi:10.1155/2014/346763. https://projecteuclid.org/euclid.jam/1425305805