Slacks-Based Efficiency Measures
The output–input ratio and radial distance function measures discussed in the preceding two chapters are essentially the same approach expressed in different forms, bearing the primal-dual relationship. The basic idea is to measure the relative distance between the DMU being evaluated and its projection on the production frontier along the ray from the origin pointing at the DMU. The efficiencies are thus radial measures. In contrast, there are also non-radial measures, and slacks-based measures are the major branch of these.
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