High-Dimensional Posterior Consistency in Bayesian Vector Autoregressive Models
High-Dimensional Posterior Consistency in Bayesian Vector Autoregressive Models
复制标题
贝叶斯向量自回归模型中的高维后验一致性
DOI:
10.1080/01621459.2018.1437043
复制
发表时间:
2018
影响因子:
3.7
通讯作者:
Michailidis, George
中科院分区:
文献类型:
--
作者:
Ghosh, Satyajit;Khare, Kshitij;Michailidis, George
Vector autoregressive (VAR) models aim to capture linear temporal interdependencies among multiple time series. They have been widely used in macroeconomics and financial econometrics and more recently have found novel applications in functional genomics and neuroscience. These applications have also accentuated the need to investigate the behavior of the VAR model in a high-dimensional regime, which provides novel insights into the role of temporal dependence for regularized estimates of the model’s parameters. However, hardly anything is known regarding properties of the posterior distribution for Bayesian VAR models in such regimes. In this work, we consider a VAR model with two prior choices for the autoregressive coefficient matrix: a nonhierarchical matrix-normal prior and a hierarchical prior, which corresponds to an arbitrary scale mixture of normals. We establish posterior consistency for both these priors under standard regularity assumptions, when the dimension p of the VAR model grows with the sample size n (but still remains smaller than n). A special case corresponds to a shrinkage prior that introduces (group) sparsity in the columns of the model coefficient matrices. The performance of the model estimates are illustrated on synthetic and real macroeconomic datasets. Supplementary materials for this article are available online.
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DOI:
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发表时间:
2005
期刊:
影响因子:
--
作者:
J. Stock;M. Watson
通讯作者:
M. Watson
影响因子:
1.6
作者:
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Hee‐Seok Oh
DOI:
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发表时间:
1979
期刊:
影响因子:
--
作者:
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通讯作者:
Robert B. Litterman
影响因子:
2.4
作者:
Schweinberger, Michael;Babkin, Sergii;Ensor, Katherine B.
通讯作者:
Ensor, Katherine B.
DOI:
--
发表时间:
1983
期刊:
影响因子:
--
作者:
J. Hartigan
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