Weighted MAPE

[vipett]

I would like to calculate a weighted MAPE but first I can't get the total to work, and secondly no clue how to solve the weighted part.

Currently I have two measures, [Current Forecast] and [Actual]. The forecast comparison has three dimensions, Product Group, Country and Month.

This version of MAPE gives me a total line which is just based on the totals per column, but I want to capture acutal MAPE per line and then have the average per product group as the total:

MAPE = IF([Actual]=0,1,ABS(([Actual]-[Current forecast])/[Actual]))

In this version I tried with Hasonevalue, but still can't get it to work, same output as the above forumula:

MAPE2 =

VAR MapeElement =

IF([Actual]=0,1,ABS(([Actual]-[Current forecast])/[Actual]))

)

RETURN

IF(

    HASONEVALUE(FCTProductMap[Product Group]),

    MapeElement,

    AVERAGEX(FCTProductMap,

    MapeElement

    )

)

This is what my table looks like.

MAPE2 should be ~129% and if I have weighted MAPE2 based on Forecast (Acutal where forecast = 0 ), it should be 199%

[mgooren]

Hi, 

have you considerd that 1 is the same as 100%, so if you have an actual of 0, the value one would then be translated to 100%. The 12.28% for instance would be 0.1228.

Hope this helps you!

[vipett]

Hi, Yes, if the actual = 0 while we have a forecast, or if the forecast is 0 and the acutal is larger than 0, then it it is a 100% error