Identifiability and estimation of structural vector autoregressive models for subsampled and mixed-frequency time series
降采样与混频时间序列中结构向量自回归模型的可识别性与估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究降采样和混频多变量时间序列,并使用结构 VAR 识别即时与滞后关系,直接对应时间序列及 VAR 方向。
降采样与混频时间序列中结构向量自回归模型的可识别性与估计AI 解读 ↓
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Summary Causal inference in multivariate time series is challenging because the sampling rate may not be as fast as the time scale of the causal interactions, so the observed series is a subsampled version of the desired series. Furthermore, series may be observed at different sampling rates, yielding mixed-frequency series. To determine instantaneous and lagged effects between series at the causal scale, we take a model-based approach that relies on structural vector autoregressive models. We present a unifying framework for parameter identifiability and estimation under subsampling and mixed frequencies when the noise, or shocks, is non-Gaussian. By studying the structural case, we develop identifiability and estimation methods for the causal structure of lagged and instantaneous effects at the desired time scale. We further derive an exact expectation-maximization algorithm for inference in both subsampled and mixed-frequency settings. We validate our approach in simulated scenarios and on a climate and an econometric dataset.