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arXiv 1002.4257math.STstat.TH
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积分广义Ornstein-Uhlenbeck过程的样本自协方差函数和极值的渐近结果

Asymptotic results for sample autocovariance functions and extremes of integrated generalized Ornstein-Uhlenbeck processes

Vicky Fasen

摘要:

考虑正平稳广义Ornstein-Uhlenbeck过程\[V_t=\mathrm{e}^{-ξ_t}\biggl(\int_0^t\mathrm{e}^{ξ_{s-}}\ ,\mathrm{d}η_s+V_0\biggr)\qquadfor t\geq0,\]和积分广义Ornstein-Uhlenbeck过程$I_k=\int_{k-1}^k\sqrt{V_{t-}} \mathrm{d}L_t$的增量$k\in\mathbb{N}$,其中$(ξ_t,η_t,L_t)_{t\geq0}$是与初始随机变量$V_0$无关的三维Lévy过程.广义模型是一个随机递归方程的连续时间版本。因此,我们的模型包括,特别是,连续时间版本的$\operatorname {ARCH}(1)$和$\operatorname {GARCH}(1,1)$过程。本文研究了$(V_t)_{t\geq0}$和$(I_k)_{k\in\mathbb{N}}$的极值点的渐近性态和样本自协方差函数。此外,我们提出了一个中心极限的结果$(I_k)_{k\in\mathbb{N}}$。正则变分和点过程收敛在建立$(V_t)_{t\geq0}$和$(I_k)_{k\in\mathbb{N}}$的统计量中起着至关重要的作用。该理论可应用于$\operatorname {COGARCH}(1,1)$和Nelson扩散模型。

英文摘要:

We consider a positive stationary generalized Ornstein--Uhlenbeck process \[V_t=\mathrm{e}^{-ξ_t}\biggl(\int_0^t\mathrm{e}^{ξ_{s-}}\ ,\mathrm{d}η_s+V_0\biggr)\qquadfor t\geq0,\] and the increments of the integrated generalized Ornstein--Uhlenbeck process $I_k=\int_{k-1}^k\sqrt{V_{t-}} \mathrm{d}L_t$, $k\in\mathbb{N}$, where $(ξ_t,η_t,L_t)_{t\geq0}$ is a three-dimensional Lévy process independent of the starting random variable $V_0$. The genOU model is a continuous-time version of a stochastic recurrence equation. Hence, our models include, in particular, continuous-time versions of $\operatorname {ARCH}(1)$ and $\operatorname {GARCH}(1,1)$ processes. In this paper we investigate the asymptotic behavior of extremes and the sample autocovariance function of $(V_t)_{t\geq0}$ and $(I_k)_{k\in\mathbb{N}}$. Furthermore, we present a central limit result for $(I_k)_{k\in\mathbb{N}}$. Regular variation and point process convergence play a crucial role in establishing the statistics of $(V_t)_{t\geq0}$ and $(I_k)_{k\in\mathbb{N}}$. The theory can be applied to the $\operatorname {COGARCH}(1,1)$ and the Nelson diffusion model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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