Adaptive forecasting in the presence of recent and ongoing structural change
近期及持续结构变化下的自适应预测AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确讨论时间序列预测、持续结构变化,以及宏观序列中的数据降权调参。
近期及持续结构变化下的自适应预测AI 解读 ↓
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We consider time series forecasting in the presence of ongoing structural change where both the time series dependence and the nature of the structural change are unknown. Methods that downweight older data, such as rolling regressions, forecast averaging over different windows and exponentially weighted moving averages, known to be robust to historical structural change, are found also to be useful in the presence of ongoing structural change in the forecast period. A crucial issue is how to select the degree of downweighting, usually defined by an arbitrary tuning parameter. We make this choice data-dependent by minimising the forecast mean square error, and provide a detailed theoretical analysis of our proposal. Monte Carlo results illustrate the methods. We examine their performance on 97 US macro series. Forecasts using data-based tuning of the data discount rate are shown to perform well.