SUMX vs SUM gives different total - why

[ramandeep007]

Hi,

I am learning X-Functions in PowerBI. I have table (visitData) in which there are 4 customer and their total number of visit and their spent per visit.

Customer, SpendPerVisit,No.OfVisit
a,50,7
b,40,3
c,100,12
d,15,4

Now, i am using measure to calculate their total spent per visit and AverageSpentPerVisit without using X-functions

AverageSpentPerVisit Wrong = AVERAGE(VisitData[spend per visit])
TotalSpentPerVisit = [AverageSpentPerVisit Wrong] * [TotalNoOfVisit]

it gives me result as below:-

When i use X-Function and calculate Average = Divide(totalSpent,NoOfVisit) then it gives different result as shown in below :-

Measures : 

AverageSpentPerVisit New = DIVIDE([TotalSpentSumX],[TotalNo.OfVisit New])

Can someone please help me to defferentiate the result between this?

Thanks in advance

[affan]

Hi @ramandeep007

If you see both of your total results you can understand that both of them are wrong.

In AverageSpentPerVisit Wrong the total is shown as 51.25.

In AverageSpentPerVisit New the total is shown as 66.54

Whereas the total should be 205. Your issue is not with the SUM or SUMX it is regarding the 'Row Context'

AverageSpentPerVisit Wrong = var _avg=AVERAGE(VisitData[spend per visit])
return
IF(HASONEVALUE(VisitData[Customer]),_avg,SUMX(VALUES(VisitData[Customer]),_avg))

If this helped you, please mark this post as an accepted solution and like to give KUDOS .

Regards,

Affan

[ramandeep007 · Accepted solution]

Hi @affan,

Thanks for reply and helpin me. your solution is also working.

But i got work around the solution and i check the matrix total is right. Why, because

in this case, in the Total column is like :-

TotalOfTotalSpendPerVisit/TotalOfTotalNo.OfVisit

That's Why it is showing me $51 in first matrix and $66 in second matrix.

[v-chuncz-msft]

@ramandeep007,

Glad to hear that. You may help accept the solution above. Your contribution is highly appreciated.

[themistoklis]

@ramandeep007

You can check the following links. They are describing your issue:

https://exceleratorbi.com.au/use-sum-vs-sumx/

https://powerpivotpro.com/2014/10/sum-sumx-or-calculatechoices-choices/