Bayesian Markov-Switching Tensor Regression for Time-Varying Networks
用于时变网络的贝叶斯马尔可夫切换张量回归AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确建模多层网络时间序列,并以马尔可夫切换刻画突发结构变化,直接对应网络、时间序列和结构变化。
用于时变网络的贝叶斯马尔可夫切换张量回归AI 解读 ↓
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Modeling time series of multilayer network data is challenging due to the peculiar characteristics of real-world networks, such as sparsity and abrupt structural changes. Moreover, the impact of external factors on the network edges is highly heterogeneous due to edge- and time-specific effects. Capturing all these features results in a very high-dimensional inference problem. A novel tensor-on-tensor regression model is proposed, which integrates zero-inflated logistic regression to deal with the sparsity, and Markov-switching coefficients to account for structural changes. A tensor representation and decomposition of the regression coefficients are used to tackle the high-dimensionality and account for the heterogeneous impact of the covariate tensor across the response variables. The inference is performed following a Bayesian approach, and an efficient Gibbs sampler is developed for posterior approximation. Our methodology applied to financial and email networks detects different connectivity regimes and uncovers the role of covariates in the edge-formation process, which are relevant in risk and resource management. Code is available on GitHub. Supplementary materials for this article are available online.