For your retail time series (Exercise 5 above): a. develop an appropriate seasonal ARIMA model; b. compare the forecasts with those you obtained in earlier chapters; c. Obtain up-to-date retail data...

For your retail time series (Exercise 5 above):

a. develop an appropriate seasonal ARIMA model;

b. compare the forecasts with those you obtained in earlier chapters;

c. Obtain up-to-date retail data from the ABS website (Cat 8501.0, Table

11), and compare your forecasts with the actual numbers. How good were the forecasts from the various models?