DEA-Solver applies the following notation to describe DEA models.
Model Name - I or O – C, V or GRS
where I or O corresponds to “Input”- or “Output”-orientation, and C or V to “Constant” or “Variable” returns to scale, respectively. For example, “AR-I-C” means the Input-oriented Assurance Region model under Constant returns-to-scale assumption. In some cases, “I or O” and/or “C or V” are omitted. For example, “CCR-I” indicates the Input oriented CCR model that is naturally under constant returns-to-scale. “GRS” indicates the “General” returns to scale model. Models with the GRS extension demand to input two parameters through keyboard. The one is the lower bound L of the sum of lambdas (λ) (see Page 138 of the Springer Introductory Text) and the other its upper bound U. “Bilateral” “Congestion” and “FDH” have no extensions. The abbreviated model names correspond to the following models. (Chapter number indicates that of the Springer Introductory Text.)
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