The functionality and main features of the system are illustrated by a simple case study - an evaluation of performance of pension funds in the Czech Republic. The application allows to calculate super-efficiency measures for most of the models mentioned. The Excel spreadsheet for this DEA example is shown in Exhibit 4.22. This application includes basic envelopment models with constant and variable returns to scale, SBM models, models with undesirable inputs and outputs and models with uncontrollable input and outputs. Data envelopment analysis (DEA) is a linear programming application that compares a number of service units of the same typesuch as banks, hospitals, restaurants, and schoolsbased on their inputs (resources) and outputs. The paper describes an original MS Excel add-on application that offers a simple tool for solving several standard DEA models. This solver has many limitations, but it is usually a sufficient tool for DEA models. In this case it is possible to use the built-in MS Excel solver. Unfortunately specialized optimization packages are not available to typical users. A standard LP solver is the only requirement for solving DEA models. They are based on the definition of efficiency as the ratio of the sum of outputs produced by the unit divided by the sum of inputs spent in the production process. DEA models are tools for evaluation of efficiency and performance of decision making units.
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