Open Access
March 2011 Improved variable selection with Forward-Lasso adaptive shrinkage
Peter Radchenko, Gareth M. James
Ann. Appl. Stat. 5(1): 427-448 (March 2011). DOI: 10.1214/10-AOAS375


Recently, considerable interest has focused on variable selection methods in regression situations where the number of predictors, p, is large relative to the number of observations, n. Two commonly applied variable selection approaches are the Lasso, which computes highly shrunk regression coefficients, and Forward Selection, which uses no shrinkage. We propose a new approach, “Forward-Lasso Adaptive SHrinkage” (FLASH), which includes the Lasso and Forward Selection as special cases, and can be used in both the linear regression and the Generalized Linear Model domains. As with the Lasso and Forward Selection, FLASH iteratively adds one variable to the model in a hierarchical fashion but, unlike these methods, at each step adjusts the level of shrinkage so as to optimize the selection of the next variable. We first present FLASH in the linear regression setting and show that it can be fitted using a variant of the computationally efficient LARS algorithm. Then, we extend FLASH to the GLM domain and demonstrate, through numerous simulations and real world data sets, as well as some theoretical analysis, that FLASH generally outperforms many competing approaches.


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Peter Radchenko. Gareth M. James. "Improved variable selection with Forward-Lasso adaptive shrinkage." Ann. Appl. Stat. 5 (1) 427 - 448, March 2011.


Published: March 2011
First available in Project Euclid: 21 March 2011

zbMATH: 1220.62089
MathSciNet: MR2810404
Digital Object Identifier: 10.1214/10-AOAS375

Keywords: Forward Selection , Lasso , shrinkage , Variable selection

Rights: Copyright © 2011 Institute of Mathematical Statistics

Vol.5 • No. 1 • March 2011
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