Modified weighted power variations of the Hermite process and applications to integrated volatility

A. Ayache, L. Loosveldt and C.A. Tudor

Stochastic Processes and their Applications, 2026, vol. 199, issue C

Abstract: We study the asymptotic behaviour of modified weighted power variations of the Hermite process of arbitrary order. By selecting suitable “good” increments and exploiting their decomposition into dominant independent components, we establish a central limit theorem for weighted p-variations using tools from Stein-Malliavin calculus. Our results extend previous works on modified quadratic and wavelet-based variations to general powers and to weighted settings, with explicit bounds in Wasserstein distance. We further apply these limit theorems to construct asymptotically Gaussian estimators of integrated volatility in Hermite-driven models, thereby extending fBm-based methods to non-Gaussian settings. The last part of our work contains numerical simulations which illustrate the practical performance of the proposed estimators.

Date: 2026
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DOI: 10.1016/j.spa.2026.104977

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