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Worst possible sub-directions in high-dimensional models

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  • van de Geer, Sara

Abstract

We examine the rate of convergence of the Lasso estimator of lower dimensional components of the high-dimensional parameter. Under bounds on the ℓ1-norm on the worst possible sub-direction these rates are of order |J|logp/n where p is the total number of parameters, n is the number of observations and J⊂{1,…,p} represents a subset of the parameters. We also derive rates in sup-norm in terms of the rate of convergence in ℓ1-norm. The irrepresentable condition on a set J requires that the ℓ1-norm of the worst possible sub-direction is sufficiently smaller than one. In that case sharp oracle results can be obtained. Moreover, if the coefficients in J are small enough the Lasso will put these coefficients to zero. By de-sparsifying one obtains fast rates in supremum norm without conditions on the worst possible sub-direction. The results are extended to M-estimation with ℓ1-penalty for generalized linear models and exponential families. For the graphical Lasso this leads to an extension of known results to the case where the precision matrix is only approximately sparse. The bounds we provide are non-asymptotic but we also present asymptotic formulations for ease of interpretation.

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  • van de Geer, Sara, 2016. "Worst possible sub-directions in high-dimensional models," Journal of Multivariate Analysis, Elsevier, vol. 146(C), pages 248-260.
    • Handle: RePEc:eee:jmvana:v:146:y:2016:i:c:p:248-260
    DOI: 10.1016/j.jmva.2015.09.018
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    References listed on IDEAS

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    1. A. Belloni & V. Chernozhukov & L. Wang, 2011. "Square-root lasso: pivotal recovery of sparse signals via conic programming," Biometrika, Biometrika Trust, vol. 98(4), pages 791-806.
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    6. Sara Geer, 2014. "Weakly decomposable regularization penalties and structured sparsity," Scandinavian Journal of Statistics, Danish Society for Theoretical Statistics;Finnish Statistical Society;Norwegian Statistical Association;Swedish Statistical Association, vol. 41(1), pages 72-86, March.
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    1. Jana Janková & Sara Geer, 2017. "Honest confidence regions and optimality in high-dimensional precision matrix estimation," TEST: An Official Journal of the Spanish Society of Statistics and Operations Research, Springer;Sociedad de Estadística e Investigación Operativa, vol. 26(1), pages 143-162, March.

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