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arXiv math/0607803math.STstat.TH
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关于长期相关和均值变化之间的区别

On discriminating between long-range dependence and changes in mean

István Berkes, Lajos Horváth, Piotr Kokoszka, Qi-Man Shao

摘要:

我们发展了一个检验程序,用于区分长相关的时间序列和均值具有变点的弱相关的时间序列。在最简单的情况下,在原假设下,时间序列是弱相关的,在一个未知点上的平均值有一个变化,而在另一种情况下,它是长期相关的。我们计算的统计$T_n$,这使我们能够构建一个估计量$\hat{k}$的变化点。然后,我们基于直到时间$\hat{k}$的观测计算统计$T_{n,1}$,并且基于时间$\hat{k}$之后的观测计算统计$T_{n,2}$。统计量$M_n=\max[T_{n,1},T_{n,2}]$在零值下收敛于众所周知的分布,但如果观测值表现出长程相关性,则发散至无穷大。该理论说明了例子和应用程序的回报率的道琼斯指数。

英文摘要:

We develop a testing procedure for distinguishing between a long-range dependent time series and a weakly dependent time series with change-points in the mean. In the simplest case, under the null hypothesis the time series is weakly dependent with one change in mean at an unknown point, and under the alternative it is long-range dependent. We compute the CUSUM statistic $T_n$, which allows us to construct an estimator $\hat{k}$ of a change-point. We then compute the statistic $T_{n,1}$ based on the observations up to time $\hat{k}$ and the statistic $T_{n,2}$ based on the observations after time $\hat{k}$. The statistic $M_n=\max[T_{n,1},T_{n,2}]$ converges to a well-known distribution under the null, but diverges to infinity if the observations exhibit long-range dependence. The theory is illustrated by examples and an application to the returns of the Dow Jones index.

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