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arXiv 2202.12644econ.EM
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大型贝叶斯向量自回归的变分推断

Variational inference for large Bayesian vector autoregressions

Mauro Bernardi, Daniele Bianchi, Nicolas Bianco

AI总结:

提出一种新颖的变分贝叶斯方法,通过直接在回归系数矩阵上设定分层收缩先验来估计高维VAR模型,显著提升了预测的统计与经济价值。

摘要:

我们提出了一种新颖的变分贝叶斯方法,用于估计带有分层收缩先验的高维向量自回归(VAR)模型。我们的方法不依赖传统的结构VAR表示来进行参数空间的后验推断。相反,我们直接在回归系数矩阵上设定分层收缩先验,使得(1)先验结构直接映射到简化型转移矩阵的后验推断中,(2)后验估计对变量排列更加稳健。广泛的模拟研究提供了证据,表明我们的方法与现有的线性和非线性马尔可夫链蒙特卡洛及变分贝叶斯方法相比表现更优。我们在均值-方差投资者将财富分配于大量不同行业投资组合的背景下,研究了我们变分推断方法预测的统计价值和经济价值。结果表明,更准确的估计转化为显著的统计和经济的样本外收益。这些结果在不同的分层收缩先验和模型维度下均成立。

英文摘要:

We propose a novel variational Bayes approach to estimate high-dimensional vector autoregression (VAR) models with hierarchical shrinkage priors. Our approach does not rely on a conventional structural VAR representation of the parameter space for posterior inference. Instead, we elicit hierarchical shrinkage priors directly on the matrix of regression coefficients so that (1) the prior structure directly maps into posterior inference on the reduced-form transition matrix, and (2) posterior estimates are more robust to variables permutation. An extensive simulation study provides evidence that our approach compares favourably against existing linear and non-linear Markov Chain Monte Carlo and variational Bayes methods. We investigate both the statistical and economic value of the forecasts from our variational inference approach within the context of a mean-variance investor allocating her wealth in a large set of different industry portfolios. The results show that more accurate estimates translate into substantial statistical and economic out-of-sample gains. The results hold across different hierarchical shrinkage priors and model dimensions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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