Abstract
In this paper, several concepts of portfolio efficiency testing are compared, based either on data envelopment analysis (DEA) or the second-order stochastic dominance (SSD) relation: constant return to scale DEA models, variable return to scale (VRS) DEA models, diversification-consistent DEA models, pairwise SSD efficiency tests, convex SSD efficiency tests and full SSD portfolio efficiency tests. Especially, the equivalence between VRS DEA model with binary weights and the SSD pairwise efficiency test is proved. DEA models equivalent to convex SSD efficiency tests and full SSD portfolio efficiency tests are also formulated. In the empirical application, the efficiency testing of 48 US representative industry portfolios using all considered DEA models and SSD tests is presented. The obtained efficiency sets are compared. A special attention is paid to the case of small number of the inputs and outputs. It is empirically shown that DEA models equivalent either to the convex SSD test or to the SSD portfolio efficiency test work well even with quite small number of inputs and outputs. However, the reduced VRS DEA model with binary weights is not able to identify all the pairwise SSD efficient portfolios.
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Notes
The existence of zero value of \(\mathrm CVaR _{\alpha _{s}}(- R_0 )\) can be detected prior to testing and in the positive case, the data matrix can be shifted by an arbitrary constant. This data transformation would be harmless because SSD efficiency is shift equivariant.
The levels belong to the set of values considered in the DEA tests equivalent to SSD tests. This was not the case in Branda (2012c).
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Acknowledgments
The research was supported by the Czech Science Foundation under the Grants P402/10/1610, P402/12/0558. We would like to express our gratitude to the anonymous referees, whose comments have greatly improved the paper.
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Branda, M., Kopa, M. On relations between DEA-risk models and stochastic dominance efficiency tests. Cent Eur J Oper Res 22, 13–35 (2014). https://doi.org/10.1007/s10100-012-0283-2
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DOI: https://doi.org/10.1007/s10100-012-0283-2