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You will now compute 'by hand' the forecasts for the next 4 months for the ARIMA(3,1,1). Compare your results to those obtained via R and

  1. You will now compute 'by hand' the forecasts for the next 4 months for the ARIMA(3,1,1). Compare your results to those obtained via R and the function forecast(modelname, h=4). Show all of your work. You will need to work with (11B2B23B3)(1B)yt= (1 +1B)et and use the 3 steps procedure described in our last lesson.

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