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math.ST updates on arXiv.org

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On the generic uniform uniqueness of the LASSO estimator
Stephane Chretien, Sebastien Darses · 2011-05-07 · via math.ST updates on arXiv.org

The LASSO is a variable subset selection procedure in statistical linear regression based on $\ell_1$ penalization of the least-squares operator. Uniqueness of the LASSO is an important issue, especially for the study of the LASSO path. The goal of the present paper is to provide a generic sufficient condition on the design matrix for the LASSO minimizer to be unique. Unlike previous works on the question of uniqueness, our condition only depends on the design matrix. Our study is based on a general position condition on the design matrix which holds with probability one for most experimental models.

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