FindtherootsoftheARand MApolynomialsfortheARMA X t 25 X t 1 0 75 X t 2 e t 2 e t 1 Use them to check causality, stationarity, and invertibility

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FindtherootsoftheARand MApolynomialsfortheARMA X t = . 25 X t 1 0 . 75 X t 2 + e t +2 e t 1 . Use

FindtherootsoftheARand MApolynomialsfortheARMA

X_t=.25X_t₁0.75X_t₂+e_t+2e_t₁.

Use them to check causality, stationarity, and invertibility.

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