DAX for Calulation column

[Anonymous]

I have column A, I want to create a 'calculation column' B.   The calculation function please find from B's calculation. 

Thanks!

[v-cherch-msft · Accepted solution]

Hi @Anonymous 

You may use below dax to get the calculated column.

Column =
VAR a =
    PRODUCTX (
        FILTER ( Data, Data[Index] <= EARLIER ( Data[Index] ) - 1 ),
        Data[A]
    )
VAR b = Data[A]
RETURN
    IF ( Data[Index] = 1, Data[A] * 1, a * b )

Regards,