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• W2522842610 abstract "We consider the estimation and inference of graphical models that characterize the dependency structure of high-dimensional tensor-valued data. To facilitate the estimation of the precision matrix corresponding to each way of the tensor, we assume the data follow a tensor normal distribution whose covariance has a Kronecker product structure. A critical challenge in the estimation and inference of this model is the fact that its penalized maximum likelihood estimation involves minimizing a non-convex objective function. To address it, this paper makes two contributions: (i) In spite of the non-convexity of this estimation problem, we prove that an alternating minimization algorithm, which iteratively estimates each sparse precision matrix while fixing the others, attains an estimator with an optimal statistical rate of convergence. (ii) We propose a de-biased statistical inference procedure for testing hypotheses on the true support of the sparse precision matrices, and employ it for testing a growing number of hypothesis with false discovery rate (FDR) control. The asymptotic normality of our test statistic and the consistency of FDR control procedure are established. Our theoretical results are backed up by thorough numerical studies and our real applications on neuroimaging studies of Autism spectrum disorder and users' advertising click analysis bring new scientific findings and business insights. The proposed methods are encoded into a publicly available R package Tlasso." @default.
• W2522842610 created "2016-09-30" @default.
• W2522842610 creator A5019708503 @default.
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• W2522842610 date "2016-09-15" @default.
• W2522842610 modified "2023-09-28" @default.
• W2522842610 title "Tensor Graphical Model: Non-convex Optimization and Statistical Inference" @default.
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• W2522842610 doi "https://doi.org/10.48550/arxiv.1609.04522" @default.
• W2522842610 hasPublicationYear "2016" @default.
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