title: Genome-wide association analysis by lasso penalized logistic regression.
abstract: BACKGROUND
  In ordinary regression, imposition of a lasso penalty makes continuous model selection straightforward. Lasso penalized regression is particularly advantageous when the number of predictors far exceeds the number of observations.
  
  
  METHODS
  The present article evaluates the performance of lasso penalized logistic regression in case-control disease gene mapping with a large number of SNPs (single nucleotide polymorphisms) predictors. The strength of the lasso penalty can be tuned to select a predetermined number of the most relevant SNPs and other predictors. For a given value of the tuning constant, the penalized likelihood is quickly maximized by cyclic coordinate ascent. Once the most potent marginal predictors are identified, their two-way and higher order interactions can also be examined by lasso penalized logistic regression.
  
  
  RESULTS
  This strategy is tested on both simulated and real data. Our findings on coeliac disease replicate the previous SNP results and shed light on possible interactions among the SNPs.
  
  
  BACKGROUND
  The software discussed is available in Mendel 9.0 at the UCLA Human Genetics web site.
  
  
  BACKGROUND
  Supplementary data are available at Bioinformatics online.
authors.affiliation: Department of Epidemiology and Biostatistics, University of Maryland, College Park, MD 20742, USA.
authors.forename: Tong Tong
authors.initials: TT
authors.lastname: Wu
authors.forename: Yi Fang
authors.initials: YF
authors.lastname: Chen
authors.forename: Trevor
authors.initials: T
authors.lastname: Hastie
authors.forename: Eric
authors.initials: E
authors.lastname: Sobel
authors.forename: Kenneth
authors.initials: K
authors.lastname: Lange
mesh_terms: D019295:Computational Biology / Q000379:methods; D055106:Genome-Wide Association Study; D020407:Internet; D016015:Logistic Models; D020641:Polymorphism, Single Nucleotide; D012984:Software