Changes of Efficiency Over Time

  • Chiang Kao
Part of the International Series in Operations Research & Management Science book series (ISOR, volume 240)


The DEA technique measures efficiency in a relative manner, in that the performances of the DMUs in a group are compared with each other. The efficient ones may not be efficient when compared with the DMUs of other groups. Similarly, the inefficient ones may become efficient when compared with those of other groups. The efficiency measures for DMUs of different groups are thus not comparable.


Input Vector Technical Change Output Vector Productivity Index Base Period 
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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Chiang Kao
    • 1
  1. 1.Department of Industrial and Information ManagementNational Cheng Kung UniversityTainanTaiwan

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