engleski

A note on robustness of the efficient DMUs in data envelopment analysis

Sensitivity analysis of extreme efficient DMUs was studied by Zhu (J. Zhu, EOR(90)(3)(1996)451-460) using the modified CCR (A. Charnes, W.W. Cooper, E. Rhodes, EOR 2(1978)429-444)model. Upward proportional variations of inputs and downward proportional variations of outputs were considered. The procedure suggested by Zhu is a new approach to sensitivity analysis and can result in sufficient and necessary conditions on the changes which do not alter the efficiency of DMUs. However, in certain instances the results presented by Zhu do not hold. The aim of this note is to poin out shortcomings which can be met following procedure proposed by Zhu. This includes inefficieny of so-called projected points, domination of obtained hyperplane, case of simultaneous changes of inputs and outputs, and case of infeasibility even if all data are greater than 0.

DEA; CCR model; Sensitivity analysis

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