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arXiv 1205.6607math.STstat.TH
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高维随机向量的独立性检验

Independence Test for High Dimensional Random Vectors

G. M. Pan, J. Gao, Y. Yang, M. Guo

摘要:

提出了一种新的高维随机向量相互独立性检验方法。检验统计量基于样本协方差阵的经验谱分布的特征函数。在零和局部备择假设下,检验统计量的渐近分布被确定为维数,并且数据的样本量具有可比性。我们应用这个检验来检验多个MA(1)和AR(1)模型,具有某些空间横截面结构的面板数据模型。此外,该方法还可以灵活地应用于非线性MA(1)模型、多MA(1)模型和Vandermonde矩阵等相关但不相关的结构。仿真结果提供了检测这些依赖结构。对纽约证券交易所(NYSE)多家公司收盘股价之间相关性的实证研究表明,股票市场普遍存在横截面相关性特征。

英文摘要:

This paper proposes a new mutual independence test for a large number of high dimensional random vectors. The test statistic is based on the characteristic function of the empirical spectral distribution of the sample covariance matrix. The asymptotic distributions of the test statistic under the null and local alternative hypotheses are established as dimensionality and the sample size of the data are comparable. We apply this test to examine multiple MA(1) and AR(1) models, panel data models with some spatial cross-sectional structures. In addition, in a flexible applied fashion, the proposed test can capture some dependent but uncorrelated structures, for example, nonlinear MA(1) models, multiple ARCH(1) models and vandermonde matrices. Simulation results are provided for detecting these dependent structures. An empirical study of dependence between closed stock prices of several companies from New York Stock Exchange (NYSE) demonstrates that the feature of cross--sectional dependence is popular in stock markets.

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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