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arXiv 1504.08264math.PR
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跳变下积分(协)波动率向量阈值估计的大偏差

Large deviations of the Threshold estimator of integrated (co-)volatility vector in the presence of jumps

Hacène Djellout, Hui Jiang

摘要:

利用金融价格过程的高频数据估计已实现波动率和协波动率是金融计量学研究的热点。阈值估计是从离散观测值推断跳型随机过程的一种有效方法。本文采用Mancini提出的门限估计,其中只考虑给定门限函数下的变化。本文的目的是研究综合方差-协方差向量的阈值估计的大偏差和中等偏差。本文是一个扩展以前的工作在Dabriout等人。在那里的问题已经研究了在没有跳跃组件。我们将使用近似引理来证明LDP。正如读者所期望的那样,我们得到的结果与没有跳跃的情况相同。

英文摘要:

Recently a considerable interest has been paid on the estimation problem of the realized volatility and covolatility by using high-frequency data of financial price processes in financial econometrics. Threshold estimation is one of the useful techniques in the inference for jump-type stochastic processes from discrete observations. In this paper, we adopt the threshold estimator introduced by Mancini where only the variations under a given threshold function are taken into account. The purpose of this work is to investigate large and moderate deviations for the threshold estimator of the integrated variance-covariance vector. This paper is an extension of the previous work in Djellout et al. where the problem has been studied in absence of the jump component. We will use the approximation lemma to prove the LDP. As the reader can expect we obtain the same results as in the case without jump.

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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