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On the use of super-efficiency procedures for ranking efficient units and identifying outliers. (English) Zbl 1364.90133
Summary: Prior research [R. D. Banker and H. Chang, Eur. J. Oper. Res. 175, No. 2, 1311–1320 (2006; Zbl 1142.90417)] has found that super-efficiency based procedures are effective in identifying outliers, but not in ranking efficient units. In this paper, we investigate why the procedures failed to rank efficient units satisfactorily and examine the performance of super-efficiency procedures in different “regions” of production set. We find that the unsatisfactory results mainly originate from the “left corners” of DMUs, those units with relatively smaller values. We further examine the effect of different noise levels on outlier detection using the BG procedure [R. D. Banker and J. L. Gifford, “A relative efficiency model for the evaluation of public health nurse productivity”, Mimeo, Pittsburgh: Carnegie Mellon University (1988)]. Our results show that the BG procedure is more effective when the noise level is high. We conduct extensive simulation experiments by considering different production functions (Cobb-Douglas and Polynomial), different DEA formulations (BCC and CCR) and different returns-to-scale (CRS and NIRS) assumptions. Our simulation results confirm that the findings in Banker and Chang (2006) are robust under different DEA formulations, production functions and returns to scale assumptions.

MSC:
90B30 Production models
62-07 Data analysis (statistics) (MSC2010)
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