Noncausal AR processes driven by causal GARCH volatility
由因果 GARCH 波动驱动的非因果自回归过程AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要研究 AR 时间序列与 GARCH 波动模型,并明确提供金融数据应用。
由因果 GARCH 波动驱动的非因果自回归过程AI 解读 ↓
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This paper studies the introduction of causal conditional heteroskedasticity in noncausal autoregressive (AR) models. We demonstrate that, in this framework, large shocks to the innovation process driving the GARCH error term of a noncausal AR model result in heightened volatility immediately before and after a bubble crash. The non-coincidence of the σ-fields generated by past observations and past values of the GARCH process makes statistical inference nonstandard. In particular, the full quasi-maximum likelihood estimator (QMLE) is generally inconsistent. We investigate the asymptotic properties of three-step weighted least squares estimators of the AR coefficient and the QMLE of the volatility parameters. Our findings are illustrated by Monte Carlo experiments and an empirical application to financial data.
多维因果时间过程准极大似然估计量的渐近正态性
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基于条件异方差识别日度油价冲击及其不确定性
This paper develops a daily structural VAR for identifying oil price shocks from conditional heteroskedasticity and quantifies the transmission of their timevarying uncertainty. Identification exploits volatility clustering and spillovers in a structural GARCH specification and the complete identified set is derived. We derive covariance impulse response functions and introduce a time-varying forecast error variance decomposition (TV-FEVD) that allows for a decomposition of…
Tensor-BEKK:张量时间序列的条件协方差建模与推断
Modern economic and financial data are increasingly organized as multiway arrays, with observations indexed simultaneously by geographic regions, industrial sectors, asset categories, and other economic characteristics. Representing such data as tensor-valued time series preserves their intrinsic multiway structure. Although substantial effort has been devoted to modeling the conditional mean of tensor-valued time series, comparatively less attention has been paid to their…
分数高斯过程的复合似然推断与序贯最优子集选择
The composite likelihood method reduces the computational cost of parameter estimation in time series by considering several subsets of observations instead of all observations at once. The asymptotic properties of this method are related to the Godambe information, an extension of the Fisher information that accounts for the dependence between subsets of observations. We aim to apply this method to linear Gaussian models, in particular fractional Brownian motion and…
非线性模型时变参数的局部多项式估计
We develop a novel asymptotic theory for local polynomial extremum estimators of time-varying parameters in a broad class of nonlinear time-series models, including discrete-valued ones. We show that the proposed estimators are asymptotically normally distributed under weak conditions. We also provide a precise characterization of the leading bias term due to smoothing. We demonstrate the usefulness of our general results by establishing primitive conditions for local…
整数值平滑转换 GARCH 模型:设定与检验
This paper introduces a new class of nonlinear models known as the Z-valued smooth transition GARCH model, designed to accommodate Z-valued time series that display asymmetric, nonlinear and highly persistent volatility. The paper outlines the maximum likelihood estimation procedure and establishes its consistency and asymptotic normality of the estimated parameters. Three types of tests are studied, including sup-type linearity test, score-based goodness-of-fit test, and…