arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1907.02443stat.MLcs.LGstat.ME
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网络关联数据的高维高斯图模型

High-dimensional Gaussian graphical model for network-linked data

University of Virginia(弗吉尼亚大学);Southeast University(东南大学);University of Michigan(密歇根大学)

Tianxi Li, Cheng Qian, Elizaveta Levina, Ji Zhu

摘要:

图形模型通常用于表示变量之间的条件依赖关系。有多种方法可用于从高维数据中探索它们,但几乎所有方法都依赖于观测值独立且同分布的假设。与此同时,通过网络连接的观察变得越来越普遍,并且往往违反这些假设。在这里,我们开发了一个高斯图形模型,用于通过具有潜在不同均值向量的网络连接的观测值,这些均值向量在网络上平滑变化。我们提出了一个有效的估计算法,并证明其有效性的模拟和真实数据,获得有意义的和可解释的结果统计合作网络。我们还证明了我们的方法估计的逆协方差阵和相应的图结构正确的网络“凝聚力”的假设下,这是指经验观察到的现象,网络邻居共享相似的特质。

英文摘要:

Graphical models are commonly used to represent conditional dependence relationships between variables. There are multiple methods available for exploring them from high-dimensional data, but almost all of them rely on the assumption that the observations are independent and identically distributed. At the same time, observations connected by a network are becoming increasingly common, and tend to violate these assumptions. Here we develop a Gaussian graphical model for observations connected by a network with potentially different mean vectors, varying smoothly over the network. We propose an efficient estimation algorithm and demonstrate its effectiveness on both simulated and real data, obtaining meaningful and interpretable results on a statistics coauthorship network. We also prove that our method estimates both the inverse covariance matrix and the corresponding graph structure correctly under the assumption of network “cohesion”, which refers to the empirically observed phenomenon of network neighbors sharing similar traits.

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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