Detecting changes in the trend function of heteroscedastic time series
异方差时间序列趋势函数的变化检测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究异方差、短程依赖时间序列的均值恒定检验,并明确覆盖平滑与突发变化,对应时间序列和结构变化。
异方差时间序列趋势函数的变化检测AI 解读 ↓
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We propose a new asymptotic test to assess the stationarity of a time series' mean that is applicable in the presence of both heteroscedasticity and short-range dependence. Our test statistic is composed of Gini's mean difference of local sample means. To analyse its asymptotic behaviour, we develop new limit theory for U-statistics of strongly mixing triangular arrays under non-stationarity. Most importantly, we show asymptotic normality of the test statistic under the hypothesis of a constant mean and prove the test's consistency against a very general class of alternatives, including both smooth and abrupt changes in the mean. We propose estimators for all parameters involved, including an adapted subsampling estimator for the long run variance, and show their consistency. Our procedure is practically evaluated in an extensive simulation study and in two data examples.