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arXiv 2107.02891math.STmath.PRstat.MEstat.TH
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高维高斯时间序列最大样本谱相干性的渐近分布

On the asymptotic distribution of the maximum sample spectral coherence of Gaussian time series in the high dimensional regime

Alexis Rosuel, Philippe Loubaton, Pascal Vallet

摘要:

研究了当维数M和样本样本个数N均趋于无穷大时,M元复高斯时间序列的谱相干性的频率平滑估计的最大值的渐近分布.如果B表示基础平滑周期图估计的平滑跨度,则在速率假设M N $\rightarrow$ 0和M B $\rightarrow$ c $\in$(0,+ $\infty$)下获得I型极值极限分布。然后利用这一结果来建立一个具有受控渐近水平的统计量,用于检验所观察到的时间序列的M个分量之间的独立性。数值模拟支持我们的结果。

英文摘要:

We investigate the asymptotic distribution of the maximum of a frequency smoothed estimate of the spectral coherence of a M-variate complex Gaussian time series with mutually independent components when the dimension M and the number of samples N both converge to infinity. If B denotes the smoothing span of the underlying smoothed periodogram estimator, a type I extreme value limiting distribution is obtained under the rate assumptions M N $\rightarrow$ 0 and M B $\rightarrow$ c $\in$ (0, +$\infty$). This result is then exploited to build a statistic with controlled asymptotic level for testing independence between the M components of the observed time series. Numerical simulations support our results.

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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