The weighted absolute percentage error (WAPE) is defined in an update rule and is calculated per data source.
The system uses the following algorithm for this:
t-1 t-1
WAPE (t, s,n) = Σ ( APE(i,i-s) * Act(i) ) / Σ Act(i)
i=t-n i=t-n
Symbol |
Description |
|
Current calendar week |
|
Shift into the future for which the WAPE is to be calculated |
|
Number of calendar weeks to be taken into account in the calculation |
|
WAPE for calendar week
|
|
Actual sales quantity for calendar week
|
By definition there is no WAPE value for the current calendar week.