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arXiv 1807.01133stat.ME
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动态网络上的时间序列建模

Time Series Modeling on Dynamic Networks

Jonas Krampe

摘要:

本文主要研究具有固定顶点数的动态网络的动态属性建模问题。这些属性被认为是时间序列,其依赖结构受到底层网络的影响。它们是由一个多变量双随机时间序列框架,即我们假设线性过程的系数矩阵是随机过程本身。我们明确允许系数矩阵的动态以及这两个随机过程之间的依赖。该框架允许对属性和底层网络进行单独建模。在这种情况下,我们定义网络自回归模型,并讨论其平稳性条件。此外,估计方法讨论了在低维和高维设置,以及如何将其应用于预测。有限样本行为的预测方法进行了研究。这种方法适用于实际数据,目标是预测33个经济体的国内生产总值。

英文摘要:

This paper focuses on modeling the dynamic attributes of a dynamic network with a fixed number of vertices. These attributes are considered as time series which dependency structure is influenced by the underlying network. They are modeled by a multivariate doubly stochastic time series framework, that is we assume linear processes for which the coefficient matrices are stochastic processes themselves. We explicitly allow for dependence in the dynamics of the coefficient matrices as well as between these two stochastic processes. This framework allows for a separate modeling of the attributes and the underlying network. In this setting, we define network autoregressive models and discuss their stationarity conditions. Furthermore, an estimation approach is discussed in a low- and high-dimensional setting and how this can be applied to forecasting. The finite sample behavior of the forecast approach is investigated. This approach is applied to real data whereby the goal is to forecast the GDP of 33 economies.

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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