Scholtes, S.

ficiency error netput level fi rms noise noise level / journal production ef ficiency approach journal analysis press t value ficient hypothesis sample statistic varian pareto econometrics kuosmanen l 2 norm data envelopment analysis –koopman percent stability press 131–162 article example input signi ficance level distribution output ef ficiency hypothesis power price error variance section ln norm problem radius test statistic frequency assumption variance sample size number research fit ef ficiency measure speci vector ef ficiency test variable deviation function non-parametric inef ficiency subsample frontier test procedure estimation simulation estimate charne property ficance signi n ¼ 250 procedure pareto –koopmans notion programming type ii error increase objective transformation envelopment