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Kernel Minimum Divergence Portfolios

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  • Linda Chamakh
  • Zolt'an Szab'o

Abstract

Portfolio optimization is a key challenge in finance with the aim of creating portfolios matching the investors' preference. The target distribution approach relying on the Kullback-Leibler or the $f$-divergence represents one of the most effective forms of achieving this goal. In this paper, we propose to use kernel and optimal transport (KOT) based divergences to tackle the task, which relax the assumptions and the optimization constraints of the previous approaches. In case of the kernel-based maximum mean discrepancy (MMD) we (i) prove the analytic computability of the underlying mean embedding for various target distribution-kernel pairs, (ii) show that such analytic knowledge can lead to faster convergence of MMD estimators, and (iii) extend the results to the unbounded exponential kernel with minimax lower bounds. Numerical experiments demonstrate the improved performance of our KOT estimators both on synthetic and real-world examples.

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  • Linda Chamakh & Zolt'an Szab'o, 2021. "Kernel Minimum Divergence Portfolios," Papers 2110.09516, arXiv.org.
    • Handle: RePEc:arx:papers:2110.09516
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