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Bayesian nonparametric sparse seemingly unrelated regression model (SUR)

Listed author(s):
  • Monica Billio

    ()

    (Ca' Foscari University of Venice, Department of Economics and GRETA Associati, Venice)

  • Roberto Casarin

    ()

    (Ca' Foscari University of Venice, Department of Economics and GRETA Associati, Venice)

  • Luca Rossini

    ()

    (Ca' Foscari University of Venice, Department of Economics)

Seemingly unrelated regression (SUR) models are used in studying the interactions among economic variables of interest. In a high dimensional setting and when applied to large panel of time series, these models have a large number of parameters to be estimated and suffer from inferential problems. We propose a Bayesian nonparametric hierarchical model for multivariate time series in order to avoid the overparametrization and overfitting issues and to allow for shrinkage toward multiple prior means with unknown location, scale and shape parameters. We propose a two-stage hierarchical prior distribution. The first stage of the hierarchy consists in a lasso conditionally independent prior distribution of the Normal-Gamma family for the SUR coefficients. The second stage is given by a random mixture distribution for the Normal-Gamma hyperparameters, which allows for parameter parsimony through two components. The first one is a random Dirac point-mass distribution, which induces sparsity in the SUR coefficients; the second is a Dirichlet process prior, which allows for clustering of the SUR coefficients. We provide a Gibbs sampler for posterior approximations based on introduction of auxiliary variables. Some simulated examples show the efficiency of the proposed methods. We study the effectiveness of our model and inference approach with an application to macroeconomics.

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File URL: http://www.unive.it/media/allegato/DIP/Economia/Working_papers/Working_papers_2016/WP_DSE_billio_casarin_rossini_20_16.pdf
File Function: First version, 2016
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Paper provided by Department of Economics, University of Venice "Ca' Foscari" in its series Working Papers with number 2016:20.

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Length: 46 pages
Date of creation: 2016
Handle: RePEc:ven:wpaper:2016:20
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