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Modeling Extreme Events: Time-Varying Extreme Tail Shape

Enzo D’Innocenzo, Andre Lucas, Bernd Schwaab and Xin Zhang

Journal of Business & Economic Statistics, 2024, vol. 42, issue 3, 903-917

Abstract: We propose a dynamic semiparametric framework to study time variation in tail parameters. The framework builds on the Generalized Pareto Distribution (GPD) for modeling peaks over thresholds as in Extreme Value Theory, but casts the model in a conditional framework to allow for time-variation in the tail parameters. We establish parameter regions for stationarity and ergodicity and for the existence of (unconditional) moments and consider conditions for consistency and asymptotic normality of the maximum likelihood estimator for the deterministic parameters in the model. Two empirical datasets illustrate the usefulness of the approach: daily U.S. equity returns, and 15-min euro area sovereign bond yield changes.

Date: 2024
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Related works:
Working Paper: Modeling extreme events:time-varying extreme tail shape (2023) Downloads
Working Paper: Modeling extreme events: time-varying extreme tail shape (2021) Downloads
Working Paper: Modeling extreme events: time-varying extreme tail shape (2020) Downloads
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DOI: 10.1080/07350015.2023.2260439

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