=E g. Compare both the MAD and MSE values of these four forecasting methods when they are applied retrospectively to the last three years.

10.31. Reconsider Problem 10.8. Ralph Billett realizes that the last-value method is considered to be the naive forecasting method, so he wonders whether he should be using another method. Therefore, he has decided to use the available Excel templates that consider seasonal effects to apply various statistical forecasting methods retrospectively to the past three years of data and compare both their MAD and MSE values.