Make a Column that averages numbers from another Column Based on Relationship

[WirelessBrains]

So I have a column that is formatted as follows

Booking_Table

Order # | Vendor  |  Days Difference

1               Vnd1                  3

2               Vnd1                  6

3               Vnd1                -1

4               Vnd2                  4

5               Vnd2                  5

6               Vnd3                 -2

And a second table that is compoased of just distinct vendors

Vendor_Average

Vendor | 

Vnd1

Vnd2

Vnd3

I want to add a second column to this table that is the AVERAGE of a vendors days diference from table one, as shown below

Vendor_Average

Vendor | Average Days

Vnd1                2.1

Vnd2               -1.3

Vnd3                4.1

I have tried the following along with several other things but I have not been able to figure out what to do exactly. It seems like a simple concept but I cannot figure out how to execute it. Any assistance in the correct direction would be apprecieated.

Note, this is the DAX expression to create the table, I am attempting to add the column through the table creation expression.

Vendor_Average = SUMMARIZE(Booking_Table, Booking_Table[Vendor], "AvgNumDay", AVERAGEX(FILTER(Booking_Table, Booking_Table[Vendor] = RELATED(Vendor_Average(Vendor))

[v-yulgu-msft · Accepted solution]

Hi @WirelessBrains,

Please modify your DAX formula as below:

Vendor_Average =
SUMMARIZE (
    Booking_Table,
    Booking_Table[Vendor],
    "Average Days", AVERAGE ( Booking_Table[Days Difference] )
)

Regards,

Yuliana Gu

[WirelessBrains]

Worked perfectly! Glad to see that I was not that far off, thanks.