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arXiv 0712.0459math.PR
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重尾因子模型的大偏差

Large Deviations for Heavy-Tailed Factor Models

Boualem Djehiche, Jens Svensson

摘要:

本文研究了重尾因子模型中相依随机变量和的大偏差概率,假设各分量是规则变化的。我们确定的条件下,因子和特质的条款有助于行为的尾部概率的总和。一个简单的条件蒙特卡罗算法也提供了与模拟和大偏差近似之间的比较。我们还研究了具有因子结构的随机过程的大偏差概率。所涉及的过程被假定为Levy过程与定期变化的跳跃措施。基于本文第一部分的结果,我们表明,在有限的时间间隔上的大偏差是由于一个大的跳跃,可以来自因子或特质的过程的一部分。

英文摘要:

We study large deviation probabilities for a sum of dependent random variables from a heavy-tailed factor model, assuming that the components are regularly varying. We identify conditions where both the factor and the idiosyncratic terms contribute to the behaviour of the tail-probability of the sum. A simple conditional Monte Carlo algorithm is also provided together with a comparison between the simulations and the large deviation approximation. We also study large deviation probabilities for stochastic processes with factor structure. The processes involved are assumed to be Levy processes with regularly varying jump measures. Based on the results of the first part of the paper, we show that large deviations on a finite time interval are due to one large jump that can come from either the factor or the idiosyncratic part of the process.

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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