... simply rib approximator简易肋骨合拢器 simply periodic function简单周期函数 The heat is simply poisonous热得人烦极了 ...
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结果表明，动态自回归模型时变参数（时变系数）的变化是有规律的，其增量大体上是一些简单周期函数的叠加。
The results showed that the change of time-varying parameters (coefficient) in dynamic AR model has a regularity. Its increments are piled up by some simple period functions.
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