In the determination of the most efficient decision making unit in data envelopment analysis: A comment

Maziar Salahi, Mehdi Toloo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


In order to deal with finding the most efficient unit problem, Lam (2015) recently built a new integrated mixed integer linear programming model which is nearly close to the super-efficiency model. The suggested model involves a non-Archimedean epsilon as the lower bound for the input and output weights. Selecting a suitable value for epsilon is a challenging issue in DEA (Data Envelopment Analysis). Lam (2015) suggested a value for epsilon which guarantees the feasibility of his model; however, this paper illustrates that the model may fail to find the most efficient unit due to unsuitable selected value for epsilon. To cope with this issue, a new model is formulated which provides the maximum epsilon value for the model of Lam (2015). The built model guarantees that when epsilon is maximum, then Lam's model gives exactly one DMU (Decision Making Unit) as the most efficient unit with the maximum discrimination distance from the other DMUs.

Original languageEnglish
Pages (from-to)216-218
Number of pages3
JournalComputers and Industrial Engineering
Publication statusPublished - Feb 1 2017


  • Data envelopment analysis
  • Mixed integer linear programming model
  • Most efficient DMU
  • Non-Archimedean epsilon

ASJC Scopus subject areas

  • Computer Science(all)
  • Engineering(all)

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