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arXiv 2410.18445stat.ME
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使用图自回归模型从平稳信号推断潜在图

Inferring Latent Graphs from Stationary Signals Using a Graphical Autoregressive Model

Jedidiah Harwood, Debashis Paul, Jie Peng

AI总结:

本文提出图自回归模型GAR,将逆协方差表示为潜在图归一化拉普拉斯的二阶多项式,并用惩罚最大似然三步法推断潜在图,在模拟和S&P 500数据中优于高斯图模型。

摘要:

图是表示金融和神经科学等领域中变量之间关系的一种直观方式。然而,这些图通常需要从数据中推断出来。在本文中,我们提出了一种新颖的框架,通过将观测到的多维数据视为以图为参考的平稳信号来推断潜在图。具体而言,我们引入了图自回归模型(GAR),其中观测信号的逆协方差矩阵被表示为潜在图的归一化图拉普拉斯矩阵的二阶多项式。GAR模型将时间序列分析中的自回归模型扩展到一般的无向图,为图推断提供了一种新方法。为了估计潜在图,我们基于惩罚最大似然开发了一个三步流程,并得到理论分析和数值实验的支持。模拟研究以及对S&P 500股价数据的应用表明,当GAR模型很好地拟合观测数据时,其性能可以优于高斯图模型。我们的结果表明,GAR模型为在多种应用中推断潜在图提供了一个有前景的新方向。代码和示例脚本可在https://github.com/jed-harwood/SGM获取。

英文摘要:

Graphs are an intuitive way to represent relationships between variables in fields such as finance and neuroscience. However, these graphs often need to be inferred from data. In this paper, we propose a novel framework to infer a latent graph by treating the observed multidimensional data as graph-referenced stationary signals. Specifically, we introduce the graphical autoregressive model (GAR), where the inverse covariance matrix of the observed signals is expressed as a second-order polynomial of the normalized graph Laplacian of the latent graph. The GAR model extends the autoregressive model from time series analysis to general undirected graphs, offering a new approach to graph inference. To estimate the latent graph, we develop a three-step procedure based on penalized maximum likelihood, supported by theoretical analysis and numerical experiments. Simulation studies and an application to S&P 500 stock price data show that the GAR model can outperform Gaussian graphical models when it fits the observed data well. Our results suggest that the GAR model offers a promising new direction for inferring latent graphs across diverse applications. Codes and example scripts are available at https://github.com/jed-harwood/SGM .

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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