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Article
Balanced Bayesian LASSO for Heavy Tails
Journal of Statistical Computation and Simulation
  • Daniel F. Linder, Georgia Southern University
  • Viral Panchal, Georgia Southern University
  • Hani Samawi, Georgia Southern University
  • Duchwan Ryu, Northern Illinois University
Document Type
Article
Publication Date
1-1-2016
DOI
10.1080/00949655.2015.1053886
Abstract

Regression procedures are not only hindered by large p and small n, but can also suffer in cases when outliers are present or the data generating mechanisms are heavy tailed. Since the penalized estimates like the least absolute shrinkage and selection operator (LASSO) are equipped to deal with the large p small n by encouraging sparsity, we combine a LASSO type penalty with the absolute deviation loss function, instead of the standard least squares loss, to handle the presence of outliers and heavy tails. The model is cast in a Bayesian setting and a Gibbs sampler is derived to efficiently sample from the posterior distribution. We compare our method to existing methods in a simulation study as well as on a prostate cancer data set and a base deficit data set from trauma patients.

Citation Information
Daniel F. Linder, Viral Panchal, Hani Samawi and Duchwan Ryu. "Balanced Bayesian LASSO for Heavy Tails" Journal of Statistical Computation and Simulation Vol. 86 Iss. 6 (2016) p. 1115 - 1132 ISSN: 1563-5163
Available at: http://works.bepress.com/hani_samawi/61/