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## Converting Excel formula to DAX

Hello all.

I am having trouble creating a measure requirement from the client that calculates their yearly churn rate.

Excel formula and expected output Cumulative:

 ID Date Customers Churn rate Cumulative Formula C 2018 52 0.99 51.48 =C2*D2 C 2019 182 0.98 228.8104 =(C3+E2)*D3 C 2020 178 0.95 386.46988 =(C4+E3)*D4 C 2021 252 0.98 625.700482 =(C5+E4)*D5 C 2022 302 0.94 872.038453 =(C6+E5)*D6

Currently, this is my measure:

``````#Cumulative =
CALCULATE (
SUM ( [Customers] ) * SUM ( [Churn Rate] ),
FILTER (
ALL ( 'Table' ),
Table[ID] = MAX ( Table[ID] )
&& Table[Year] <= MAX ( Table[Year] )
)
)``````

Is it possible to recreate the requirement dynamically? I'm at wits' end on understanding the logic flow.

Thank you.

syncinatti

5 REPLIES 5
Super User

Hi @syncinatti
Please refer to attached file with the solution

``````Cumulative =
VAR CurrentDate = SELECTEDVALUE ( 'Table'[Date] )
VAR CurrentIDTable =
CALCULATETABLE ( 'Table', ALLEXCEPT ( 'Table', 'Table'[ID] ) )
VAR T1 = FILTER ( CurrentIDTable, 'Table'[Date] <= CurrentDate )
RETURN
SUMX (
T1,
VAR CurrentDate1 = 'Table'[Date]
VAR Customers = 'Table'[Customers]
VAR T2 = FILTER ( T1, 'Table'[Date] >= CurrentDate1 )
VAR ChurnRate = PRODUCTX ( T2, [Churn rate] )
RETURN
Customers * ChurnRate
)``````
Community Support

Hi @syncinatti ,

I'm sorry that DAX can't support recursive operation so far. You can choose  calculate it in Excel and then import it into  Power BI Desktop.

Best regards,
Community Support Team_ Binbin Yu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Anonymous
Not applicable

@syncinatti , this involves recursion. I'm not sure that's possible in DAX.

New Member

Now that's the word I'm looking for, "recursive" formula. This is essentially impossible on my level, and can be made only through a bloody workaround.

Super User

Why not possible?

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