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Estimation of optimal portfolio compositions for small sampleand singular covariance matrix

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Abstract

In the paper we consider the optimal portfolio choice problem under parameter uncertainty when the covariance matrix of asset returns is singular. Very useful stochastic representations are deduced for the characteristics of the expected utility optimal portfolio. Using these stochastic representations, we derive the moments of higher order of the estimated expected return and the estimated variance of the expected utility optimal portfolio. Another line of applications leads to their asymptotic distributions obtained in the high-dimensional setting. Via a simulation study, it is shown that the derived high-dimensional asymptotic distributions provide good approximations of the exact ones even for moderate sample sizes.

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  • Bodnar, Taras & Mazur, Stepan & Nguyen, Hoang, 2022. "Estimation of optimal portfolio compositions for small sampleand singular covariance matrix," Working Papers 2022:15, Örebro University, School of Business.
    • Handle: RePEc:hhs:oruesi:2022_015
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    10. Mårten Gulliksson & Anna Oleynik & Stepan Mazur, 2024. "Portfolio Selection with a Rank-Deficient Covariance Matrix," Computational Economics, Springer;Society for Computational Economics, vol. 63(6), pages 2247-2269, June.
    11. David Bauder & Taras Bodnar & Nestor Parolya & Wolfgang Schmid, 2021. "Bayesian mean–variance analysis: optimal portfolio selection under parameter uncertainty," Quantitative Finance, Taylor & Francis Journals, vol. 21(2), pages 221-242, February.
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    13. Taras Bodnar & Yarema Okhrin & Nestor Parolya, 2022. "Optimal Shrinkage-Based Portfolio Selection in High Dimensions," Journal of Business & Economic Statistics, Taylor & Francis Journals, vol. 41(1), pages 140-156, December.
    14. David Bauder & Taras Bodnar & Stepan Mazur & Yarema Okhrin, 2018. "Bayesian Inference For The Tangent Portfolio," International Journal of Theoretical and Applied Finance (IJTAF), World Scientific Publishing Co. Pte. Ltd., vol. 21(08), pages 1-27, December.
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    Cited by:

    1. Mårten Gulliksson & Anna Oleynik & Stepan Mazur, 2024. "Portfolio Selection with a Rank-Deficient Covariance Matrix," Computational Economics, Springer;Society for Computational Economics, vol. 63(6), pages 2247-2269, June.
    2. Drin, Svitlana & Mazur, Stepan & Muhinyuza, Stanislas, 2023. "A test on the location of tangency portfolio for small sample size and singular covariance matrix," Working Papers 2023:11, Örebro University, School of Business.

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    More about this item

    Keywords

    singular Wishart distribution; mean-variance portfolio; Moore-Penrose inverse;
    All these keywords.

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions

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