Dax - How to calculate average based on quantity on each row.

[ChristianR]

I am trying to calculate an average based on number of transactions and #days to complete.  

The dataset looks like

TX_CNT           DAYS_TO_COMPLETE

    5                             13

    2                              5

    1                              3

So the average days to complete by transaction is 9.75 = ((13*5)+(5*2)+(3x1)) / (5+2+1)

I have this data in one table coming from SQL.  

How can I calculate the average across rows while considering the TX_CNT.

FYI I have other attributes in the table which I'll use for legend, slicers etc... but I am trying to create a measure I can use.

Thank you!

[Anonymous]

Hello @ChristianR ,

Create a below two measures

Measure = MAX(Table[TX_CNT])*MAX(Table[DAYS_TO_COMPLTETE])

Measure 2 = [Measure]/SUM(Table[TX_CNT])

[OwenAuger · Accepted solution]

Hi @ChristianR 

If your table contains the two columns shown, you can write a measure like this to perform the weighted-average calculation:

Average days =
DIVIDE (
    SUMX (
        YourTable,
        YourTable[TX_CNT] * YourTable[DAYS_TO_COMPLETE]
    ),
    SUM ( YourTable[TX_CNT] )
)

 Does that work for you?

Regards,

Owen

[ChristianR]

@OwenAuger perfect!   I'm still getting my bearings around DAX.

Thank you.