Optimization methods for measurement of returns to scale in the non-radial DEA models
نویسندگان
چکیده
The non-radial DEA models [1] possess some specific features. First, multiple reference sets may exist for a production unit. Second, multiple supporting hyperplanes may occur on optimal units of the frontier. Third, multiple projections (a projection set) may occur in the space of input and output variables. All these features cause certain difficulties under measurement of returns to scale of production units. The non-radial DEA model can be written in the following form [1, 2]
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