Example Case II: Choosing an Efficiency Measure and
Super-Efficiency
An efficiency measure quantifies, in one way or another, a ???distance??? to the efficient frontier
of the technology, that is, the service delivery mechanism in this context. EMS allows
computation of various distances in input-, output-, and non-oriented versions. Detailed
discussions on orientation are in the previous section.
Super-Efficiency
If we choose a radial distance, then EMS allows us to compute so-called ???super-efficiency???
scores by checking the box. For inefficient DMUs, the super-efficiency score coincides with
the standard score. For efficient DMUs, a score is computed which indicates the maximal
radial change which is feasible such that the DMU remains efficient. Formally, it is defined
like the standard score, but the DMU under evaluation is excluded from the constraints (i.e.,
the definition of the technology set).
So, if we want to find out the actually-available best producer based on the SLA parameters
values they had promised to deliver and they actually deliver, then we can choose the super-
0 Bandopadhyay & Kumar
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