The Annals of Statistics

Calibrating nonconvex penalized regression in ultra-high dimension

Lan Wang, Yongdai Kim, and Runze Li

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Abstract

We investigate high-dimensional nonconvex penalized regression, where the number of covariates may grow at an exponential rate. Although recent asymptotic theory established that there exists a local minimum possessing the oracle property under general conditions, it is still largely an open problem how to identify the oracle estimator among potentially multiple local minima. There are two main obstacles: (1) due to the presence of multiple minima, the solution path is nonunique and is not guaranteed to contain the oracle estimator; (2) even if a solution path is known to contain the oracle estimator, the optimal tuning parameter depends on many unknown factors and is hard to estimate. To address these two challenging issues, we first prove that an easy-to-calculate calibrated CCCP algorithm produces a consistent solution path which contains the oracle estimator with probability approaching one. Furthermore, we propose a high-dimensional BIC criterion and show that it can be applied to the solution path to select the optimal tuning parameter which asymptotically identifies the oracle estimator. The theory for a general class of nonconvex penalties in the ultra-high dimensional setup is established when the random errors follow the sub-Gaussian distribution. Monte Carlo studies confirm that the calibrated CCCP algorithm combined with the proposed high-dimensional BIC has desirable performance in identifying the underlying sparsity pattern for high-dimensional data analysis.

Article information

Source
Ann. Statist. Volume 41, Number 5 (2013), 2505-2536.

Dates
First available in Project Euclid: 5 November 2013

Permanent link to this document
https://projecteuclid.org/euclid.aos/1383661271

Digital Object Identifier
doi:10.1214/13-AOS1159

Mathematical Reviews number (MathSciNet)
MR3127873

Zentralblatt MATH identifier
1281.62106

Subjects
Primary: 62J05: Linear regression
Secondary: 62J07: Ridge regression; shrinkage estimators

Keywords
High-dimensional regression LASSO MCP SCAD variable selection penalized least squares

Citation

Wang, Lan; Kim, Yongdai; Li, Runze. Calibrating nonconvex penalized regression in ultra-high dimension. Ann. Statist. 41 (2013), no. 5, 2505--2536. doi:10.1214/13-AOS1159. https://projecteuclid.org/euclid.aos/1383661271


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Supplemental materials

  • Supplementary material: Supplement to “Calibrating nonconvex penalized regression in ultra-high dimension”. This supplemental material includes the proofs of Lemmas 3.1 and 6.1, and some additional numerical results.