Question: 2. The ACF and PACF provide some guidance on how to select pure AR or pure MA models. But mixture models are much harder to

2. The ACF and PACF provide some guidance on how to select pure AR or pure MA models. But mixture models are much harder to identify. Therefore it is normal to begin with either a pure AR or a pure MA model. Now it may be worth considering extending the selected model to a mixed ARMA model. ARMA models

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