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Helper I
Helper I

Calculate the Average using a Dimension column


I'm trying to calculate the Average of a dimension attribute based on a Fact table. The following are the tables (simplified, eg Category doesn't actually live in the Fact table but there to visualise what I'm trying to do)


The dimension table is:



The Fact table is:



What I'd like is to calculate the average AnswerID over all the rows in the Fact table, I've tried to create a measure but all it's doing is calculating the average over the distinct AnswerID values, not over each AnswerID that would be linked to the fact table.


Average Answer = CALCULATE(AVERAGE(DimAnswer[AnswerID]),CROSSFILTER(DimAnswer[AnswerKey],FactAnswer[AnswerKey],BOTH))


But the result is incorrect as it's just calculating the average for each distinct AnswerID.  In the case of Category A, there are 7 rows in the fact table, when the AnswerID for each of the 7 rows is add up it totals 20.  So 20/7 = 2.8.  But what my measure is doing is just taking the unique AnswerIDs which would be 2,4,6, then dividing by the distinct number of AnswerID which is 3.  So 12/3 = 4.



Could anyone point me towards how I would do the Average by taking each row in the Fact table, getting the AnswerID and then doing the average over this?


Many thanks

Super User
Super User

Hi @AndyDDC 
Please use

AverageMeasure =
AVERAGEX ( Fact, RELATED ( Dim[AnswerID] ) )

View solution in original post

Super User
Super User

Hi @AndyDDC 
Please use

AverageMeasure =
AVERAGEX ( Fact, RELATED ( Dim[AnswerID] ) )

Brilliant, thank you!

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