Question: Write down the seasonal ARIMA(1,1,2)(1,1,2)12 without constant in the backshift operators notation. In the backshift formula indicate where all components are located. (I included a

Write down the seasonal ARIMA(1,1,2)(1,1,2)12 without constant in the backshift operators

notation. In the backshift formula indicate where all components are located.

(I included a sample)

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