Forum Discussion
Need help with average measure
Hello,
I try to calculate the average of emails I receive per day in Power BI with the following measures, but the average (gemiddeld) is wrong.
Aantal emails = DISTINCTCOUNT(Mail[MailId])
Gemiddeld aantal e-mails per dag = AVERAGEX( VALUES( Datum[Date]); [Aantal emails] )
As you can see I received a total of 722 emails in 96 days so average should be 7,52 but gives me 9,28 instead.
Would really appreciate any help thank you
Hi Anonymous,
Please review the difference of results in two table visuals in below example.
Measures are:
Aantal day = DISTINCTCOUNT(Mail[Date]) Aantal emails = SUMX(DISTINCT(Mail[Date]),CALCULATE(DISTINCTCOUNT(Mail[MailId]))) Gemiddeld aantal e-mails per dag = AVERAGEX( VALUES(Mail[Date]), [Aantal emails] ) Aantal emails2 = DISTINCTCOUNT(Mail[MailId]) Gemiddeld aantal e-mails per dag2 = DISTINCTCOUNT(Mail[MailId])/DISTINCTCOUNT(Mail[Date])
In the top right table visual, the result in total row of [Aantal emails] is calculated by sum up distinctcount values of each day (3+4+2). Then, the result of Gemiddeld aantal e-mails per dag equals 9/3=3.
In the bottom right table visual, the result in total row of [Aantal emails2] is calculated by distinctcount mailid across the whole dataset. As you can see, the left table visual shows there are 4 different Email Ids. So, the result of Gemiddeld aantal e-mails per dag2 equals 4/3=1.33.
In your scenario, if you want to get the result of 7.52, you should use this measure:
Gemiddeld aantal e-mails per dag2 = DISTINCTCOUNT(Mail[MailId])/DISTINCTCOUNT(Mail[Date])
Best regards,
Yuliana Gu
3 Replies
Hi Anonymous,
Please review the difference of results in two table visuals in below example.
Measures are:
Aantal day = DISTINCTCOUNT(Mail[Date]) Aantal emails = SUMX(DISTINCT(Mail[Date]),CALCULATE(DISTINCTCOUNT(Mail[MailId]))) Gemiddeld aantal e-mails per dag = AVERAGEX( VALUES(Mail[Date]), [Aantal emails] ) Aantal emails2 = DISTINCTCOUNT(Mail[MailId]) Gemiddeld aantal e-mails per dag2 = DISTINCTCOUNT(Mail[MailId])/DISTINCTCOUNT(Mail[Date])
In the top right table visual, the result in total row of [Aantal emails] is calculated by sum up distinctcount values of each day (3+4+2). Then, the result of Gemiddeld aantal e-mails per dag equals 9/3=3.
In the bottom right table visual, the result in total row of [Aantal emails2] is calculated by distinctcount mailid across the whole dataset. As you can see, the left table visual shows there are 4 different Email Ids. So, the result of Gemiddeld aantal e-mails per dag2 equals 4/3=1.33.
In your scenario, if you want to get the result of 7.52, you should use this measure:
Gemiddeld aantal e-mails per dag2 = DISTINCTCOUNT(Mail[MailId])/DISTINCTCOUNT(Mail[Date])
Best regards,
Yuliana Gu
Hi v-yulgu-msft,
Thanks for the explanation, it makes sense.
Just one question when would you advise to use VALUES ( ) over DISTINCT () and vice versa?
Hi Anonymous,
Here is blog for your reference: Difference between DISTINCT and VALUES in DAX
Best regards,
Yuliana Gu