arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.09462stat.ME
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高维稀疏向量自回归中参数的置信区间

Confidence intervals for parameters in high-dimensional sparse vector autoregression

Ke Zhu, Hanzhong Liu

摘要:

向量自回归(VAR)模型被广泛用于分析多个变量随时间的相互关系。VAR模型转移矩阵的估计和推断对于经济、金融等领域的决策者来说是至关重要的。然而,当变量数量大于样本量时,对模型参数进行统计推断仍然是一个挑战。在这篇文章中,我们提出了去偏Lasso和两个bootstrap去偏Lasso方法来构造高维VAR模型的转移矩阵元素的置信区间。我们证明了在适当的稀疏性和其他正则条件下,所提出的方法是渐近有效的。为了实现我们的方法,我们开发了可行的和可并行化的算法,节省了大量的计算所需的节点Lasso和引导。仿真研究表明,我们的方法在有限的样本表现良好。最后,我们应用我们的方法分析了2019年标准普尔500指数中股票的价格数据。我们发现,一些股票,如世界上最大的黄金生产商,纽蒙特公司,对大多数股票具有显着的预测能力。

英文摘要:

Vector autoregression (VAR) models are widely used to analyze the interrelationship between multiple variables over time. Estimation and inference for the transition matrices of VAR models are crucial for practitioners to make decisions in fields such as economics and finance. However, when the number of variables is larger than the sample size, it remains a challenge to perform statistical inference of the model parameters. In this article, we propose the de-biased Lasso and two bootstrap de-biased Lasso methods to construct confidence intervals for the elements of the transition matrices of high-dimensional VAR models. We show that the proposed methods are asymptotically valid under appropriate sparsity and other regularity conditions. To implement our methods, we develop feasible and parallelizable algorithms, which save a large amount of computation required by the nodewise Lasso and bootstrap. A simulation study illustrates that our methods perform well in finite samples. Finally, we apply our methods to analyze the price data of stocks in the S&P 500 index in 2019. We find that some stocks, such as the largest producer of gold in the world, Newmont Corporation, have significant predictive power over the most stocks.

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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