Changepoint Detection in Heteroscedastic Random Coefficient Autoregressive Models
异方差随机系数自回归模型的变点检测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究随机系数自回归序列的参数变点及 CUSUM 检验,对应时间序列和结构变化。
异方差随机系数自回归模型的变点检测AI 解读 ↓
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We propose a family of CUSUM-based statistics to detect the presence of changepoints in the deterministic part of the autoregressive parameter in a Random Coefficient Autoregressive (RCA) sequence. Our tests can be applied irrespective of whether the sequence is stationary or not, and no prior knowledge of stationarity or lack thereof is required. Similarly, our tests can be applied even when the error term and the stochastic part of the autoregressive coefficient are non iid, covering the cases of conditional volatility and shifts in the variance, again without requiring any prior knowledge as to the presence or type thereof. In order to ensure the ability to detect breaks at sample endpoints, we propose weighted CUSUM statistics, deriving the asymptotics for virtually all possible weighing schemes, including the standardized CUSUM process (for which we derive a Darling-Erdős theorem) and even heavier weights (so-called Rényi statistics). Simulations show that our procedures work very well in finite samples. We complement our theory with an application to several financial time series.