A Link-Free Sparse Group Variable Selection Method for Single-Index Model


For regression problems with grouped covariates, we adapt the idea of sparse group lasso (SGL) [10] to the framework of the sufficient dimension reduction. Assuming that the regression falls into a single-index structure, we propose a method called the sparse group sufficient dimension reduction to conduct group and within-group variable selections simultaneously without assuming a specific link function. Simulation studies show that our method is comparable to the SGL under the regular linear model setting and outperforms SGL with higher true positive rates and substantially lower false positive rates when the regression function is nonlinear. One immediate application of our method is to the gene pathway data analysis where genes naturally fall into groups (pathways). An analysis of a glioblastoma microarray data is included for illustration of our method.


Mathematics and Statistics

Keywords and Phrases

Gene pathway analysis; Single-index model; Sparse group lasso; Sufficient dimension reduction; Variable selection

International Standard Serial Number (ISSN)

0266-4763; 1360-0532

Document Type

Article - Journal

Document Version


File Type





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Publication Date

01 Oct 2017