Average based on criteria from another column

Hi,

I have some information in CSV and wants to do calculations based on criteria (an average of output if ID's are the same)

In Excel à Column A contains "output" column B and C are ID's and in column D is the Excel calculation.

=AVERAGEIF(C:C;B2;A:A)

 is the Excel formula in D2 

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In Power Bi I've tried EARLIER and VLOOKUPS but I don't get the desired result. I think it isn't very difficult, but I cannot find it :-(

Thnx,

Manfred