Stationarity and Invertibility of the SARIMA Model

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Mak
Mak 2020-4-9
Hi,
I am working with a (S)ARIMA model: (1,1,1) x (3,1,2)_12 and want to check the stability of this model. How do I find all eigenvalues to see if they lie inside of the unit circle? I have already estimated the model.

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