Penalized regression, standard errors, and Bayesian lassos

By Minjung Kyung, Jeff Gill, Malay Ghosh, George Casella. 2010

644 citations recorded by the source corpus.

Penalized regression methods for simultaneous variable selection and coe-cient estimation, especially those based on the lasso of Tibshirani (1996), have received a great deal of attention in recent years, mostly through frequen- tist models. Properties such as consistency have been studied, and are achieved by difierent lasso variations. Here we look at a fully Bayesian formulation of the problem, which is ∞exible enough to encompass most versions of the lasso that have been previously considered. The advantages of the hierarchical Bayesian for- mulations are many. In addition to the usual ease-of-interpretation of hierarchical models, the Bayesian formulation produces valid standard errors (which can be problematic for the frequentist lasso), and is based on a geometrically ergodic Markov chain. We compare the performance of the Bayesian lassos to their fre- quentist counterparts using simulations, data sets that previous lasso papers have used, and a di-cult modeling problem for predicting the collapse of governments around the world. In terms of prediction mean squared error, the Bayesian lasso performance is similar to and, in some cases, better than, the frequentist lasso.

Subfields: Statistics and Probability

View Paper: https://www.semanticscholar.org/paper/717ce0992d640e385ae389f353e82c198b96958b

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