Spike and slab variable selection: frequentist and Bayesian strategies. (English) Zbl 1068.62079

Summary: Variable selection in the linear regression model takes many apparent faces from both frequentist and Bayesian standpoints. We introduce a variable selection method referred to as a rescaled spike and slab model. We study the importance of prior hierarchical specifications and draw connections to frequentist generalized ridge regression estimation. Specifically, we study the usefulness of continuous bimodal priors to model hypervariance parameters, and the effect scaling has on the posterior mean through its relationship to penalization.
Several model selection strategies, some frequentist and some Bayesian in nature, are developed and studied theoretically. We demonstrate the importance of selective shrinkage for effective variable selection in terms of risk misclassification, and show this is achieved using the posterior from a rescaled spike and slab model. We also show how to verify a procedure’s ability to reduce model uncertainty in finite samples using a specialized forward selection strategy. Using this tool, we illustrate the effectiveness of rescaled spike and slab models in reducing model uncertainty.


62J07 Ridge regression; shrinkage estimators (Lasso)
62J05 Linear regression; mixed models
62P10 Applications of statistics to biology and medical sciences; meta analysis
62F15 Bayesian inference
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