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A unified framework for high-dimensional analysis of \(M\)-estimators with decomposable regularizers. (English) Zbl 1331.62350
Summary: High-dimensional statistical inference deals with models in which the the number of parameters \(p\) is comparable to or larger than the sample size \(n\). Since it is usually impossible to obtain consistent procedures unless \(p/n\to 0\), a line of recent work has studied models with various types of low-dimensional structure, including sparse vectors, sparse and structured matrices, low-rank matrices and combinations thereof. In such settings, a general approach to estimation is to solve a regularized optimization problem, which combines a loss function measuring how well the model fits the data with some regularization function that encourages the assumed structure. This paper provides a unified framework for establishing consistency and convergence rates for such regularized \(M\)-estimators under high-dimensional scaling. We state one main theorem and show how it can be used to re-derive some existing results, and also to obtain a number of new results on consistency and convergence rates, in both \(\ell_{2}\)-error and related norms. Our analysis also identifies two key properties of loss and regularization functions, referred to as restricted strong convexity and decomposability, that ensure corresponding regularized \(M\)-estimators have fast convergence rates and which are optimal in many well-studied cases.

MSC:
62J07 Ridge regression; shrinkage estimators (Lasso)
Software:
hgam; PDCO
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References:
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