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arXiv 1809.03643stat.ME
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高维时间序列的门限因子模型

Threshold factor models for high-dimensional time series

Xialu Liu, Rong Chen

摘要:

我们考虑了一个高维时间序列的阈值因子模型,其中假设时间序列的动态根据阈值变量的值在不同的制度之间切换。这是阈值建模在因子结构下对高维时间序列设置的扩展。具体而言,在每个阈值制度,时间序列被假定为遵循一个因素模型。制度转换机制在因素加载矩阵中产生结构变化。它提供了灵活性,在处理的情况下,基本状态可能会随着时间的推移而改变,因为经常观察到在经济时间序列和其他应用。我们开发的程序估计的加载空间,因子的数量和阈值,以及识别的阈值变量,它管理的政权变化机制。理论性质进行了研究。给出了模拟和真实数据示例来说明所提出的方法的性能。

英文摘要:

We consider a threshold factor model for high-dimensional time series in which the dynamics of the time series is assumed to switch between different regimes according to the value of a threshold variable. This is an extension of threshold modeling to a high-dimensional time series setting under a factor structure. Specifically, within each threshold regime, the time series is assumed to follow a factor model. The regime switching mechanism creates structural change in the factor loading matrices. It provides flexibility in dealing with situations that the underlying states may be changing over time, as often observed in economic time series and other applications. We develop the procedures for the estimation of the loading spaces, the number of factors and the threshold value, as well as the identification of the threshold variable, which governs the regime change mechanism. The theoretical properties are investigated. Simulated and real data examples are presented to illustrate the performance of the proposed method.

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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