Testing out-of-sample portfolio performance

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International Journal of Forecasting. 2019, 35(2), pp. 540-554. ISSN 0169-2070. eISSN 1872-8200. Available under: doi: 10.1016/j.ijforecast.2018.09.010
Zusammenfassung

This paper studies the quality of portfolio performance tests based on out-of-sample returns. By disentangling the components of the out-of-sample performance, we show that the observed differences are driven largely by the differences in estimation risk. Our Monte Carlo study reveals that the puzzling empirical findings of inferior performances of theoretically superior strategies result mainly from the low power of these tests. Thus, our results provide an explanation as to why the null hypothesis of equal performance of the simple equally-weighted portfolio compared to many theoretically-superior alternative strategies cannot be rejected in many out-of-sample horse races. Our findings turn out to be robust with respect to different designs and the implementation strategies of the tests.

For the applied researcher, we provide some guidance as to how to cope with the problem of low power. In particular, we make use of a novel pretest-based portfolio strategy to show how the information regarding performance tests can be used optimally.

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ISO 690KAZAK, Ekaterina, Winfried POHLMEIER, 2019. Testing out-of-sample portfolio performance. In: International Journal of Forecasting. 2019, 35(2), pp. 540-554. ISSN 0169-2070. eISSN 1872-8200. Available under: doi: 10.1016/j.ijforecast.2018.09.010
BibTex
@article{Kazak2019Testi-43886.2,
  year={2019},
  doi={10.1016/j.ijforecast.2018.09.010},
  title={Testing out-of-sample portfolio performance},
  number={2},
  volume={35},
  issn={0169-2070},
  journal={International Journal of Forecasting},
  pages={540--554},
  author={Kazak, Ekaterina and Pohlmeier, Winfried}
}
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