A linear formulation of the two-level DEA model

Chiang Kao

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


In efficiency measurement, the input and output factors of similar characteristics can be grouped into input and output categories, respectively, using a weighted-average approach under the data envelopment analysis (DEA) framework to form a two-level DEA model. The resulting two-level model is nonlinear. This note transforms the nonlinear model into a linear one using a variable substitution technique. Linear models are easier to solve than their nonlinear counterparts. The linear transformation is applicable to the two-level model built from both the primal and dual forms of the conventional one-level DEA model. The linear model transformed from the nonlinear model developed from the primal form has a dual which is equivalent to the nonlinear model developed from the dual form.

Original languageEnglish
Pages (from-to)958-962
Number of pages5
Issue number6
Publication statusPublished - 2008 Dec

All Science Journal Classification (ASJC) codes

  • Strategy and Management
  • Management Science and Operations Research
  • Information Systems and Management


Dive into the research topics of 'A linear formulation of the two-level DEA model'. Together they form a unique fingerprint.

Cite this