Smooth scalar-on-image regression via spatial Bayesian variable selection

Jeff Goldsmith, Lei Huang, Ciprian M. Crainiceanu

Research output: Contribution to journalArticle

Abstract

We develop scalar-on-image regression models when images are registered multidimensional manifolds. We propose a fast and scalable Bayes' inferential procedure to estimate the image coefficient. The central idea is the combination of an Ising prior distribution, which controls a latent binary indicator map, and an intrinsic Gaussian Markov random field, which controls the smoothness of the nonzero coefficients. The model is fit using a single-site Gibbs sampler, which allows fitting within minutes for hundreds of subjects with predictor images containing thousands of locations. The code is simple and is provided in the online Appendix (see the "Supplementary Materials" section). We apply this method to a neuroimaging study where cognitive outcomes are regressed on measures of white-matter microstructure at every voxel of the corpus callosum for hundreds of subjects.

Original languageEnglish (US)
Pages (from-to)46-64
Number of pages19
JournalJournal of Computational and Graphical Statistics
Volume23
Issue number1
DOIs
StatePublished - Jan 1 2014

Keywords

  • Binary Markov random field
  • Gaussian Markov random field
  • Markov chain Monte Carlo

ASJC Scopus subject areas

  • Statistics and Probability
  • Discrete Mathematics and Combinatorics
  • Statistics, Probability and Uncertainty

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