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arXiv 2110.09596stat.MEmath.STstat.TH
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网络自回归过程的通用建模框架

A General Modeling Framework for Network Autoregressive Processes

Hang Yin, Abolfazl Safikhani, George Michailidis

摘要:

本文提出了一个灵活的网络自回归过程(NAR)框架,其中每个节点的响应线性依赖于其过去的值,一个预先指定的线性组合的相邻节点和一组节点特定的协变量。相应的系数是节点特定的,而框架可以容纳更重的比高斯误差与空间自回归和因子为基础的协方差结构。我们提供了一个充分条件,确保稳定性(平稳性)的基本NAR是显着弱于其同行在文献中以前的工作。此外,我们开发了普通和广义最小二乘估计为固定的,以及一个发散的网络节点数,并提供其岭正则化的同行,表现出更好的性能,在大型网络设置,连同他们的渐近分布。我们还解决了错误指定网络连接及其对上述各种NAR参数估计的渐近分布的影响的问题。该框架说明了合成和真实的空气污染数据。

英文摘要:

The paper develops a general flexible framework for Network Autoregressive Processes (NAR), wherein the response of each node linearly depends on its past values, a prespecified linear combination of neighboring nodes and a set of node-specific covariates. The corresponding coefficients are node-specific, while the framework can accommodate heavier than Gaussian errors with both spatial-autorgressive and factor based covariance structures. We provide a sufficient condition that ensures the stability (stationarity) of the underlying NAR that is significantly weaker than its counterparts in previous work in the literature. Further, we develop ordinary and generalized least squares estimators for both a fixed, as well as a diverging number of network nodes, and also provide their ridge regularized counterparts that exhibit better performance in large network settings, together with their asymptotic distributions. We also address the issue of misspecifying the network connectivity and its impact on the aforementioned asymptotic distributions of the various NAR parameter estimators. The framework is illustrated on both synthetic and real air pollution data.

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