Box-Jenkins models describe the future time series value by using a nonseasonal autoregressive term when the SAC dies down fairly quickly (at lags 12 and 24)and the SPAC has a spike at lag 12 and cuts off after lag 12.

Question

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Box-Jenkins models use seasonal autoregressive terms when the SPAC has a spike at a seasonal lag (e.g., lag 12) and cuts off, indicating a seasonal pattern rather than a nonseasonal one.

Box-Jenkins Models Describe the Future Time Series Value by Using