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Unexpected MAPE (Mean Absolute Percentage Error) From Procedure APPROC_CALC_ACCURACY RESULTS

edited Jun 11, 2018 8:32AM in Demantra Solutions - EBS (MOSC) 1 commentAnswered ✓

Hello!  Do you have an unexpected MAPE (Mean Absolute Percentage Error) From Procedure APPROC_CALC_ACCURACY RESULTS?  There has been a formula change to the MAPE calculation.  See below:

Unexpected MAPE (Mean Absolute Percentage Error) From Procedure APPROC_CALC_ACCURACY RESULTS - Formula Change - NOT Release Code

This patch, 27057455, changes the the formula used by the APPROC_CALC_ACCURACY procedure to be MAPE.  The changed formula to calculate MAPE first calculates the APE (Absolute Percent Error) for each time period and then averages the result across all the time periods.  In the case when there is no history but the forecast exists we set MAPE to be 200%, unless both history and forecast are 0 in which case MAPE is 0.

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