A Note on Overdifferencing and the Equivalence of Seasonal Time Series Models With Monthly Means and Models With (0, 1, 1) 12 Seasonal Parts When ⊖ = 1
过度差分与季节模型等价性:⊖=1 时的月度均值与季节 ARIMA 模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确比较月度季节均值与季节 ARIMA 模型,并讨论初始观测和过度差分,直接属于季节时间序列方法。
过度差分与季节模型等价性:⊖=1 时的月度均值与季节 ARIMA 模型AI 解读 ↓
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Two general models for monthly seasonal time series are considered, one in which seasonality is modeled with monthly means and another in which seasonality is modeled with a (0, 1, 1)12 ARIMA structure. The models are shown to be equivalent if the seasonal moving average parameter (⊖) is 1 and if the same assumptions about the 12 initial observations are made for both models. The role of the assumptions about the initial observations is analyzed, and it is argued that for practical purposes the two models can be regarded as equivalent when ⊖ = 1. It is observed that the result extends easily to more general models involving overdifferencing.