Browsing by Author "Portela, Maria Conceição A. Silva"
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- Economic efficiency when prices are not fixed: disentangling quantity and price efficiencyPublication . Portela, Maria Conceição A. Silva; Thanassoulis, EmmanuelThis paper proposes an approach to compute cost efficiency in contexts where units can adjust input quantities and to some degree prices so that through their joint determination they can minimise the aggregate cost of the outputs they secure. The model developed is based on the data envelopment analysis (DEA) framework and can accommodate situations where the degree of influence over prices ranges from minimal to considerable. When units cannot influence prices at all the model proposed reduces to the standard cost efficiency DEA model for the case where prices are taken as exogenous. In addition to the cost efficiency model, we introduce an additive decomposition of potential cost savings into a quantity and a price component, based on Bennet indicators.
- Efficiency and value added in secondary education: the case of PortugalPublication . Portela, Maria Conceição A. Silva
- Non-radial efficiency measurement: a review and new insights for free disposal hull technologiesPublication . Portela, Maria Conceição A. Silva; Borges, Pedro Castro
- Value and quantity data in economic and technical efficiency measurementPublication . Portela, Maria Conceição A. SilvaThis paper calls attention to the implications of using value data in efficiency measurement through Data Envelopment Analysis (DEA). The main contributions are twofold: (i) it provides a reconciliation of the previous literature on analysing issues of quantity and value data in efficiency measurement, (ii) it provides some guidelines on what to do, when these issues arise in a data set.