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Long range dependence of heavy-tailed random functions

Published online by Cambridge University Press:  16 September 2021

Rafal Kulik*
Affiliation:
University of Ottawa
Evgeny Spodarev*
Affiliation:
Ulm University
*
*Postal address: Department of Mathematics and Statistics, 150 Louis Pasteur Private, K1N 6N5 Ottawa, Ontario, Canada.
**Postal address: Institute of Stochastics, Helmholtzstrasse 18, D-89069 Ulm, Germany. Email address: [email protected]

Abstract

We introduce a definition of long range dependence of random processes and fields on an (unbounded) index space $T\subseteq \mathbb{R}^d$ in terms of integrability of the covariance of indicators that a random function exceeds any given level. This definition is specifically designed to cover the case of random functions with infinite variance. We show the value of this new definition and its connection to limit theorems via some examples including subordinated Gaussian as well as random volatility fields and time series.

Type
Original Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Applied Probability Trust

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