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分类依据与纠错

AI 根据所提供的论文材料归类:摘要核心是自回归过程、动态条件分位数及时间序列非因果性检验。

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关注这篇论文的作者
Weifeng Jin

基于分位数自回归的非因果性检验

研究问题
如何利用条件分位数的动态特征识别非因果自回归过程,并在非高斯时间序列中区分其与相应因果过程的表现?
方法与思路
作者研究非因果过程的分位数自回归性质,据此通过跨分位数斜率恒定性检验或线性模型设定检验构造三种检验策略。
材料陈述的贡献
摘要称,非因果过程的分位数自回归估计随分位数变化,并具有非线性条件分位数表示;论文据此提出检验并考察金融序列。
阅读关注点
应核对因果与非因果过程的时间方向定义、分位数性质成立的条件、检验校准,以及异方差创新和极端分位数下的表现。
阅读边界
这是 arXiv 预印本,不能据此认定已同行评审或期刊接收。这里的非因果性涉及时间序列表示,不能直接解释为经济因果效应。

原文摘要

Non-causal processes have been drawing attention recently in Macroeconomics and Finance for their ability to display nonlinear behaviors such as asymmetric dynamics, clustering volatility, and local explosiveness. In this paper, we investigate the statistical properties of empirical conditional quantiles of non-causal processes. Specifically, we show that the quantile autoregression (QAR) estimates for non-causal processes do not remain constant across different quantiles in contrast to their causal counterparts. Furthermore, we demonstrate that non-causal autoregressive processes admit nonlinear representations for conditional quantiles given past observations. Exploiting these properties, we propose three novel testing strategies of non-causality for non-Gaussian processes within the QAR framework. The tests are constructed either by verifying the constancy of the slope coefficients or by applying a misspecification test of the linear QAR model over different quantiles of the process. Some numerical experiments are included to examine the finite sample performance of the testing strategies, where we compare different specification tests for dynamic quantiles with the Kolmogorov-Smirnov constancy test. The new methodology is applied to some time series from financial markets to investigate the presence of speculative bubbles. The extension of the approach based on the specification tests to AR processes driven by innovations with heteroskedasticity is studied through simulations. The performance of QAR estimates of non-causal processes at extreme quantiles is also explored.

笔记与分组
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