Question

Wite down the following models using backshift operators: ARIMA1,1,1×0,1,1s=12 ARIMA(1,0,1)×1,1,0s=6 ARIMA(2,1,2) ARIMA(1,2,1)

Wite down the following models using backshift operators:

  1. ARIMA1,1,1×0,1,1s=12
  2. ARIMA(1,0,1)×1,1,0s=6
  3. ARIMA(2,1,2)
  4. ARIMA(1,2,1)
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