On classifying inputs and outputs in DEA: A revised model

Mehdi Toloo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (SciVal)


Cook and Zhu [Cook, W.D., Zhu, J., 2007. Classifying inputs and outputs in data envelopment analysis. European Journal of Operational Research 180, 692-699] introduced a new method to determine whether a measure is an input or an output. In practice, however, their method may produce incorrect efficiency scores due to a computational problem as result of introducing a large positive number to the model. This note introduces a revised model that does not need such a large positive number.

Original languageEnglish
Pages (from-to)358-360
Number of pages3
JournalEuropean Journal of Operational Research
Issue number1
Publication statusPublished - Oct 1 2009
Externally publishedYes


  • Computational error
  • Data envelopment analysis
  • Efficiency
  • Flexible inputs
  • Flexible outputs
  • Variable status

ASJC Scopus subject areas

  • Computer Science(all)
  • Modelling and Simulation
  • Management Science and Operations Research
  • Information Systems and Management

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