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参数模型将非平稳时间序列分离成趋势成分、周期成分和随机成分， 分别建立参数方程， 叠加后可用于非平稳时间序列的预测
The parameter model separates the non-stationary time series into the trend component, the period component and the stochastic component, establishes the parametric equation respectively and can be used for the prediction of the non-stationary time series after being superposed