Hierarchy
SAP_BASIS (Software Component) SAP Basis Component⤷
BC-SRV-BSF (Application Component) Business Service Functions⤷
SPRG (Package) Forecast Basis Separation 
Attribute
| Message class |  |
PR | |
| Short Description |  |
Forecast: Help messages | |
| Message Number |  |
419 | |
| Documentation status | |
||
| Authorization check Error Message | |||
| Changed On |  |
Message Text
Help Document
Diagnosis
There are two automatic model selection procedures:
Procedure 1
The system carries out statistical tests and checks whether a trend or a seasonal requirements pattern applies.
In the trend test, the system subjects the historical values to a regression analysis and checks to see whether there is a significant trend pattern.
In the seasonal test, the system clears the historical values of any possible trends and carries out an autocorrelation test.
Procedure 2
The system calculates the models to be tested using various combinations for alpha, beta, and gamma. The smoothing factors are also varied between 0.2 to 0.8 in intervals of 0.2.
The system then chooses the model which displays the lowest mean absolute deviation (MAD).
Procedure 2 is more precise than procedure 1 but takes much longer.
System response
Procedure 1 is always used in Flexible Planning. Both procedure 1 and procedure 2 are possible when you run the forecast in material requirements planning.
What to do
If you use the forecast in material requirements planning, you set the selection procedure in the material master record.
History
| Last changed on/by | |
19941123 | SAP |
| SAP Release Created in |
