MAD MSE MAPE RSFE TRACKING SIGNAL Period demand forecast 1 15,920 2 21,890 3 22,885 4 16,915 5 18,905 6 24,875 7 18,905 8 19,900 9 30,845 10 29,850 11 39,800 12 41,790 17,146 25,870 25,870 20,895 17,413 20,895 20,895 23,422 29,392 30,348 37,810 42,785