Risk Analysis via Generalized Pareto Distributions.

Risk Analysis via Generalized Pareto Distributions.
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DOI:
10.1080/07350015.2021.1874390
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发表时间:
2022
影响因子:
3
通讯作者:
Zhao, Zifeng
Zhao, Zifeng
中科院分区:
数学2区
文献类型:
--
作者:
He, Yi;Peng, Liang;Zhang, Dabao;Zhao, Zifeng

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We compute the value-at-risk of financial losses by fitting a generalized Pareto distribution to exceedances over a threshold. Following the common practice of setting the threshold as high sample quantiles, we show that, for both independent observations and time-series data, the asymptotic variance for the maximum likelihood estimation depends on the choice of threshold, unlike the existing study of using a divergent threshold. We also propose a random weighted bootstrap method for the interval estimation of VaR, with critical values computed by the empirical distribution of the absolute differences between the bootstrapped estimators and the maximum likelihood estimator. While our asymptotic results unify the inference with non-divergent and divergent thresholds, the finite sample studies via simulation and application to real data show that the derived confidence intervals well cover the true VaR in insurance and finance.
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