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Answers for “为什么当原始时间序列具有线性趋势时,差分会有所帮助?”

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The I in ARIMA stands for Integrated. It is implemented by modeling the differences of the original time series rather than the raw series itself.

Conditions: The context is the ARIMA time series model.; The explanation refers to the specific ARIMA(1,1,1) example shown on the board.