Reconciling mean-variance portfolio theory with non-Gaussian returns
(2022) European Journal of Operational Research — Vol. 297, n° 2, p. 729-740 (2022)
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- Abstract
- Mean-variance portfolio theory remains frequently used as an investment rationale because of its simplicity, its closed-form solution, and the availability of well-performing robust estimators. At the same time, it is also frequently rejected on the grounds that it ignores the higher moments of non-Gaussian returns. However, higher-moment portfolios are associated with many different objective functions, are numerically more complex, and exacerbate estimation risk. In this paper, we reconcile mean-variance portfolio theory with non-Gaussian returns by identifying, among all portfolios on the mean-variance efficient frontier, the one that optimizes a chosen higher-moment criterion. Numerical simulations and an empirical analysis show, for three higher-moment objective functions and adjusting for transaction costs, that the proposed portfolio strikes a favorable tradeoff between specification and estimation error. Specifically, in terms of out-of-sample Sharpe ratio and higher moments, it outperforms the global-optimal portfolio, and also the global-minimum-variance portfolio except when using monthly returns for which estimation error is more prominent.
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Lassance, N. (2022). Reconciling mean-variance portfolio theory with non-Gaussian returns. European Journal of Operational Research, 297(2), 729-740. https://doi.org/10.1016/j.ejor.2021.06.016 (Original work published 2022)