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Bayesian doubly adaptive elastic-net Lasso for VAR shrinkage

Listed author(s):
  • Gefang, Deborah

We develop a novel Bayesian doubly adaptive elastic-net Lasso (DAELasso) approach for VAR shrinkage. DAELasso achieves variable selection and coefficient shrinkage in a data-based manner. It deals constructively with explanatory variables which tend to be highly collinear by encouraging the grouping effect. In addition, it also allows for different degrees of shrinkage for different coefficients. Rewriting the multivariate Laplace distribution as a scale mixture, we establish closed-form conditional posteriors that can be drawn from a Gibbs sampler. An empirical analysis shows that the forecast results produced by DAELasso and its variants are comparable to those from other popular Bayesian methods, which provides further evidence that the forecast performances of large and medium sized Bayesian VARs are relatively robust to prior choices, and, in practice, simple Minnesota types of priors can be more attractive than their complex and well-designed alternatives.

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File URL: http://www.sciencedirect.com/science/article/pii/S0169207013000770
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Article provided by Elsevier in its journal International Journal of Forecasting.

Volume (Year): 30 (2014)
Issue (Month): 1 ()
Pages: 1-11

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Handle: RePEc:eee:intfor:v:30:y:2014:i:1:p:1-11
DOI: 10.1016/j.ijforecast.2013.04.004
Contact details of provider: Web page: http://www.elsevier.com/locate/ijforecast

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