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Answers for “什么时候会使用二阶差分而不是一阶差分？”

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The dd in ARIMA(p,d,q) represents the order of differencing, also known as the integrated component. It indicates how many times the original series has been differenced to achieve stationarity.

Conditions: The model is denoted as ARIMA(p,d,q).; dd is a non-negative integer.

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