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September 4, 2019 @ 4:00 pm - 5:00 pm
Title: Statistical analysis and spectral methods for signal-plus-noise matrix models
Presenter: Joshua Cape
Abstract:Estimating eigenvectors and principal subspaces is of fundamental importance for numerous problems in statistics, data science, and network analysis, including covariance matrix estimation, principal component analysis, and community detection. For each of these problems, we obtain foundational results that precisely quantify the local (entrywise) behavior of sample eigenvectors within the context of a unified signal-plus-noise matrix framework. Our methods and results collectively address eigenvector consistency and asymptotic normality, decompositions of large matrices, Procrustes analysis, deterministic perturbation bounds, and real-data spectral clustering applications in connectomics.