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arXiv 1606.05481math.STstat.TH
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距离相关在时间序列中的应用

Applications of Distance Correlation to Time Series

Richard A. Davis, Muneya Matsui, Thomas Mikosch, Phyllis Wan

摘要:

使用经验特征函数解决推理问题,包括在某些特殊参数设置下的估计和拟合拟合优度检验,有着悠久的历史,可以追溯到70年代(例如,参见Feuerverger和Mureika(1977),Csorgo(1981 a,1981 b,1981 c),Feuerverger(1993))。最近,在其他推理设置中使用经验特征函数已经重新引起了人们的兴趣。由Szekely和Rizzo(2009)开发的用于测量两个随机向量之间的依赖性和测试独立性的距离协方差和相关性,可能是对此最著名的说明。我们将这些想法应用到平稳的单变量和多元时间序列来测量时间序列中的滞后自相关性和交叉相关性。在强混合假设下,我们建立了样本自相关函数和交叉距离相关函数的渐近理论。我们也将自距离相关函数(ADCF)应用于自回归过程的残差,作为拟合拟合优度的检验。在自回归模型为真的情况下,经验ADCF的极限分布与基于iid序列的极限分布有很大不同。我们说明了使用的经验自动和交叉距离相关函数测试的依赖性和交叉依赖的时间序列在各种不同的情况下。

英文摘要:

The use of empirical characteristic functions for inference problems, including estimation in some special parametric settings and testing for goodness of fit, has a long history dating back to the 70s (see for example, Feuerverger and Mureika (1977), Csorgo (1981a,1981b,1981c), Feuerverger (1993)). More recently, there has been renewed interest in using empirical characteristic functions in other inference settings. The distance covariance and correlation, developed by Szekely and Rizzo (2009) for measuring dependence and testing independence between two random vectors, are perhaps the best known illustrations of this. We apply these ideas to stationary univariate and multivariate time series to measure lagged auto- and cross-dependence in a time series. Assuming strong mixing, we establish the relevant asymptotic theory for the sample auto- and cross-distance correlation functions. We also apply the auto-distance correlation function (ADCF) to the residuals of an autoregressive processes as a test of goodness of fit. Under the null that an autoregressive model is true, the limit distribution of the empirical ADCF can differ markedly from the corresponding one based on an iid sequence. We illustrate the use of the empirical auto- and cross-distance correlation functions for testing dependence and cross-dependence of time series in a variety of different contexts.

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