Difference-based covariance matrix estimation in time series nonparametric regression with application to specification tests
时间序列非参数回归中的差分协方差矩阵估计及其设定检验应用AI 解读 ↓
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时间序列非参数回归中的差分协方差矩阵估计及其设定检验应用AI 解读 ↓
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Summary Long-run covariance matrix estimation is the building block of time series inference. The corresponding difference-based estimator, which avoids detrending, has attracted considerable interest due to its robustness to both smooth and abrupt structural breaks and its competitive finite sample performance. However, existing methods mainly focus on estimators for the univariate process, while their direct and multivariate extensions for most linear models are asymptotically biased. We propose a novel difference-based and debiased long-run covariance matrix estimator for functional linear models with time-varying regression coefficients, allowing time series nonstationarity, long-range dependence, state heteroscedasticity and combinations thereof. We apply the new estimator to (i) the structural stability test, overcoming the notorious nonmonotonic power phenomena caused by piecewise smooth alternatives for regression coefficients, and (ii) the nonparametric residual-based tests for long memory, improving the performance via the residual-free formula of the proposed estimator. The effectiveness of the proposed method is justified theoretically and demonstrated by superior performance in simulation studies, while its usefulness is elaborated via real data analysis. Our method is implemented in the R package mlrv.
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SCAN:通过自适应非参数推断依次检测变点
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协整系统中平滑结构变化的检验
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随机时间序列回归模型中结构断点的非参数检测
We propose a novel nonparametric test to detect structural breaks in the conditional mean and/or variance of a time series. Our method does not assume any specific parametric form for the dependence structure of the regressor, the time series model, or the distribution of the noise. This flexibility allows our algorithm to be applicable to a wide range of framework. We further apply the proposed test to accurately localize the changepoints and establish theoretical…