Journal of Productivity Analysis

, Volume 9, Issue 3, pp 205–232

Marginal Rates and Two-dimensional Level Curves in DEA

  • Dan Rosen
  • Claire Schaffnit
  • Joseph C. Paradi
Article

Abstract

Of great importance to management, the computation of trade-offs presents particular difficulties within DEA since the piecewise linear nature of the envelopment surfaces does not allow for unique derivatives at every point. We present a comprehensive framework for analyzing marginal rates, and directional derivatives in general, on DEA frontiers. A useful characterization of these derivatives at given points can be provided in terms of the ranges they can take; equivalently, the bounds of these ranges correspond to derivatives “to the right”and “to the left” at these points. We present two approaches for their computation: first, the dual equivalents calculation of minimum and maximum multiplier ratios / finite differences, and then a modified simplex tableau method. The simplex tableau method provides a more general application of the method introduced by Hackman et al. (1994) to generate any two-dimensional section of the isoquant and is a practical tool to generate level plots of the frontier. By giving a complete picture of trade-offs and allowing a better visualization of high dimensional production possibility sets, these tools can be very useful for managerial applications.

Data Envelopment Analysis marginal rates trade-offs partial derivatives piecewise linear surfaces returns to scale 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Dan Rosen
    • 1
  • Claire Schaffnit
    • 1
  • Joseph C. Paradi
    • 1
  1. 1.Centre for Management of Technology and Entrepreneurship, Dept. of Industrial EngineeringUniversity of TorontoTorontoCANADA

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