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arXiv 2001.02579math.STstat.TH
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非线性长程相关离散时间拖网过程的谱估计

Spectral estimation for non-linear long range dependent discrete time trawl processes

Paul Doukhan, François Roueff, Joseph Rynkiewicz

摘要:

离散时间拖网过程是一类由拖网序列(a j)j $\in$ N参数化的时间序列,通过独立同分布(i.i.d.)一个连续时间进程($γ$(t))t $\in$ R的拷贝称为种子进程。它们为线性或非线性长程相关时间序列建模提供了一个通用框架。我们调查的谱估计,无论是逐点或宽带,远程依赖离散时间拖网过程。由各种种子过程和拖网顺序引起的困难是双重的。首先,谱密度可以采取不同的形式,通常包括平滑的附加校正项。第二,具有相似谱密度的拖网过程可能表现出非常不同的统计行为。我们证明了我们的估计在非常一般的条件下的一致性,我们表明,一类广泛的拖网过程满足他们。这是通过引入一个加权的弱依赖指数,可以独立的利益。宽带谱估计器包括长记忆参数的估计器。我们完成这项工作的数值实验,以评估有限的样本量的性能,这种估计为各种整数值离散时间拖网过程。

英文摘要:

Discrete time trawl processes constitute a large class of time series parameterized by a trawl sequence (a j) j$\in$N and defined though a sequence of independent and identically distributed (i.i.d.) copies of a continuous time process ($γ$(t)) t$\in$R called the seed process. They provide a general framework for modeling linear or non-linear long range dependent time series. We investigate the spectral estimation, either pointwise or broadband, of long range dependent discrete-time trawl processes. The difficulty arising from the variety of seed processes and of trawl sequences is twofold. First, the spectral density may take different forms, often including smooth additive correction terms. Second, trawl processes with similar spectral densities may exhibit very different statistical behaviors. We prove the consistency of our estimators under very general conditions and we show that a wide class of trawl processes satisfy them. This is done in particular by introducing a weighted weak dependence index that can be of independent interest. The broadband spectral estimator includes an estimator of the long memory parameter. We complete this work with numerical experiments to evaluate the finite sample size performance of this estimator for various integer valued discrete time trawl processes.

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