arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.6487stat.ME
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分位数相关与分位数自回归模型

Quantile correlations and quantile autoregressive modeling

Guodong Li, Yang Li, Chih-Ling Tsai

摘要:

在本文中,我们提出了两个重要的措施,分位数相关(QCOR)和分位数偏相关(QPCOR)。然后,我们将它们应用到分位数自回归(QAR)模型,并引入两个有价值的量,分位数自相关函数(QACF)和分位数偏自相关函数(QPACF)。这使我们能够将经典的Box-Jenkins方法扩展到分位数自回归模型。具体地说,观测到的时间序列的QPACF可以用来识别自回归阶,而从拟合模型获得的残差的QACF可以用来评估模型的适当性。我们不仅证明了QCOR、QPCOR、QACF和PQACF的渐近性质,而且给出了QAR估计的大样本结果和分位数版本的Ljung-Box检验。仿真研究表明,所提出的方法在有限样本下表现良好,并给出了一个实证例子来说明其有效性。

英文摘要:

In this paper, we propose two important measures, quantile correlation (QCOR) and quantile partial correlation (QPCOR). We then apply them to quantile autoregressive (QAR) models, and introduce two valuable quantities, the quantile autocorrelation function (QACF) and the quantile partial autocorrelation function (QPACF). This allows us to extend the classical Box-Jenkins approach to quantile autoregressive models. Specifically, the QPACF of an observed time series can be employed to identify the autoregressive order, while the QACF of residuals obtained from the fitted model can be used to assess the model adequacy. We not only demonstrate the asymptotic properties of QCOR, QPCOR, QACF, and PQACF, but also show the large sample results of the QAR estimates and the quantile version of the Ljung-Box test. Simulation studies indicate that the proposed methods perform well in finite samples, and an empirical example is presented to illustrate usefulness.

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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