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b) There is another input oriented DEA model, scale model (or VRS). This model is distinguished by an extra parameter, w . This parameter is
b) There is another input oriented DEA model,
scale model (or VRS). This model is distinguished by an extra parameter,w. This parameter is a measure of (variable) returns to scale in the assumed technology, in contrast to the assumption of constant returns to scale in the previous in class model. This leads to the following vector notation for the VRS model;
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