Super Efficiency

Abstract

When a DMU under evaluation is not included in the reference set of the envelopment models, the resulting DEA models are called super-efficiency DEA models. Churns, Haag, Jaska and Semple (1992) use a super-efficiency model to study the sensitivity of the efficiency classifications. Zhu (1996b) and Seiford and Zhu (1998d) develop a number of new super-efficiency models to determine the efficiency stability regions (see Chapter 11). Andersen and Petersen (1993) propose using the CRS super-efficiency model in ranking the efficient DMUs. Also, the super-efficiency DEA models can be used in detecting influential observations (Wilson, 1995) and in identifying the extreme efficient DMUs (Thrall, 1996). Seiford and Zhu (1999c) study the infeasibility of various super-efficiency models developed from the envelopment models in Table 1.2. Chapter 11 presents other super-efficiency models that are used in sensitivity analysis.