Dimitris Sotiros

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A two-stage production process assumes that the first stage transforms external inputs to a number of intermediate measures, which then are used as inputs to the second stage that produces the final outputs. The fundamental approaches to two-stage network data envelopment analysis are the multiplicative and the additive efficiencydecomposition approaches.(More)
We present in this paper a general network DEA approach to deal with efficiency assessments in multi-stage processes. Our approach complies with the composition paradigm, where the efficiencies of the stages are estimated first and the overall efficiency of the system is obtained ex post. We use multi-objective programming as modeling framework. This(More)
We present in this paper a network DEA approach to deal with efficiency assessments in two-stage processes. Our approach complies with the composition paradigm, where the efficiencies of the stages are estimated without a prior definition of the overall efficiency of the system. The overall efficiency is obtained by aggregating the stage efficiencies a(More)
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