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stat.ME2025★ 1 cited
Eigengap Sparsity for Covariance Parsimony
Tom Szwagier, Guillaume Olikier, Xavier Pennec
Covariance estimation is a central problem in statistics. An important issue is that there are rarely enough samples to accurately estimate the coefficients in di…
stat.ME2023★ 3 cited
The curse of isotropy: from principal components to principal subspaces
Tom Szwagier, Xavier Pennec
Principal component analysis is a ubiquitous tool in exploratory data analysis. It is widely used by applied scientists for visualization and interpretability purposes. We raise an…