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分类依据与纠错

AI 根据所提供的论文材料归类:摘要直接研究高维 VAR 与 VARMA 动态结构,并提供宏观经济时间序列应用。

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代码、数据与补充材料

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关注这篇论文的作者
Yao Zheng

用于高维时间序列的可解释且高效的无限阶向量自回归模型

研究问题
如何在高维时间序列中保留 VARMA 的丰富动态模式,同时改善模型识别、计算可行性及时间与截面依赖的可解释性?
方法与思路
作者提出稀疏无限阶 VAR,分别参数化时间与截面结构,采用两种 L1 正则化估计、块坐标下降及 BIC 阶数选择。
材料陈述的贡献
摘要称给出非渐近误差界与一致的阶数选择方法,并通过模拟和宏观经济数据分析支持模型的估计效率及解释优势。
阅读关注点
应核对无限阶系数的参数化、与 VARMA 的对应范围、稀疏性及稳定性条件,以及误差界和阶数选择一致性的要求。
阅读边界
这是 arXiv 预印本,不能据此确认同行评审或期刊接收。摘要未列明理论条件,也未量化动态信息损失及效率改善。

原文摘要

As a special infinite-order vector autoregressive (VAR) model, the vector autoregressive moving average (VARMA) model can capture much richer temporal patterns than the widely used finite-order VAR model. However, its practicality has long been hindered by its non-identifiability, computational intractability, and difficulty of interpretation, especially for high-dimensional time series. This paper proposes a novel sparse infinite-order VAR model for high-dimensional time series, which avoids all above drawbacks while inheriting essential temporal patterns of the VARMA model. As another attractive feature, the temporal and cross-sectional structures of the VARMA-type dynamics captured by this model can be interpreted separately, since they are characterized by different sets of parameters. This separation naturally motivates the sparsity assumption on the parameters determining the cross-sectional dependence. As a result, greater statistical efficiency and interpretability can be achieved with little loss of temporal information. We introduce two $\ell_1$-regularized estimation methods for the proposed model, which can be efficiently implemented via block coordinate descent algorithms, and derive the corresponding nonasymptotic error bounds. A consistent model order selection method based on the Bayesian information criteria is also developed. The merit of the proposed approach is supported by simulation studies and a real-world macroeconomic data analysis.

笔记与分组