This paper addresses an important issue in DEA: the selection of inputs and outputs to be included in a model. A two-stage methodology is suggested. The first stage applies a methodology based on comparing reduced models that do not include a particular input/output with extended models that...

A multi-activity DEA model for the joint determination of efficiencies with variable returns to scale is developed in this paper. The model contains an element of complexity that is not present in the previous DEA models for estimating returns to scale. It is found that apparent overall...

This paper sets out to determine the strategic positioning of Spanish Savings Banks, using datadrawn from published financial information. Its starting point is the idea of the strategic group, regularlyemployed in Business Management to explain the relationships between firms within the same...