The follwing are monthly actual and forcasted demand levels from May through December for
units of a product manufactured in d company.
Month- may, june, july, august. september, october, november, december.
Actual demand - 105,80,110,118,102,110,120,125
Forcasted demand- 102,100,101,98,100,104,108,109
For the given forcast the tracking signal = ?? MAD's
Solution
Actual Demand Forecasted Demand Difference Absolute difference Running sum of absoulte
difference Running Sum of forecast error MAD = Running Sum of absolute deviation/No of
months Tracking Signal = Running Sum of forecasting Error/MAD 105 102 3 3 3 3 3 1 80 100
-20 20 23 -17 11.5 -1.5 110 101 9 9 32 -8 10.67 -0.8 118 98 20 20 52 12 13.00 0.9 102 100 2
2 54 14 10.80 1.3 110 104 6 6 60 20 10 2.0 120 108 12 12 72 32 10.29 3.1 125 109 16 16 88
48 11 4.4