Forum Discussion

sam_hoccane's avatar
sam_hoccane
Helper I
4 years ago
Solved

Multiplication with Previous Values

Excel File: Link   Hello, Could you please help me write the following DAX Querry? I want to create a measure to calculate values highlighted blue in the predicted-CO2 emission column using the...
  • tamerj1's avatar
    tamerj1
    4 years ago

    sam_hoccane 
    Your wishes are my command ğŸ˜‰ Here is the workable solution exactly as you wish 
    https://we.tl/t-bo914kjbfJ

    Predicted_Measure_4 = 
VAR CurrentEmission = SUM ( Data[Emission] )
VAR CurrentMonth = SELECTEDVALUE ( data[Year_Month] )
VAR CurrentForcast = SELECTEDVALUE ( Data[forcast] )
VAR PreviousMonths = FILTER ( ALLSELECTED ( Data ), data[Year_Month] < CurrentMonth )
VAR PreviousN_Months = FILTER ( PreviousMonths, Data[forcast] = "N" )
VAR PreviousN_Month = MAXX ( PreviousN_Months, data[Year_Month] )
VAR PreviousN_Emission = SUMX ( FILTER ( PreviousN_Months, data[Year_Month] = PreviousN_Month ), Data[Emission] )
VAR YearMonthOnly = DISTINCT ( SELECTCOLUMNS ( PreviousMonths, "@YearMonth", Data[Year_Month] ) )
VAR NumberOfY_Months = COUNTROWS ( FILTER ( YearMonthOnly, [@YearMonth] > PreviousN_Month && [@YearMonth] <= CurrentMonth ) ) + 1
VAR Result =
    IF (
        CurrentForcast = "N",
        CurrentEmission,
        PreviousN_Emission * POWER ( 1.15, NumberOfY_Months )
    )
RETURN
    Result
Dhacd's avatar
Dhacd
Resolver III
4 years ago

Hi sam_hoccane,

Please find another way to achieve the desired solution below,

 

PredictedEmissions = 

Var TableN = filter('Table','Table'[forecast]="N")
Var MaxMonth = CALCULATE(MAX('Table'[Month]),TableN)
Var LastEmission = CALCULATE(MAX('Table'[CO2 Emission]),'Table'[Month]=MaxMonth,all('Table'))
Var Difference =datediff(MaxMonth,'Table'[Month],MONTH)
Var Predicted = (LastEmission *power(1.15,Difference))
return  if( 'Table'[forecast]="Y",Predicted,'Table'[CO2 Emission])

 


Screenshot Attached

 



If this post helps, then please consider accepting it as the solution to help the other members find it more quickly.

Regards,

Atma.

tamerj1's avatar
tamerj1
Community Champion
4 years ago

Dhacd 
Good job!
A few issues here.
We don't know whether "N" and "Y" cycle overtime. Therefore the maximum Month with "N" might be after the first "Y" row.
If a month reading is missing from the data (not taken or not recorded for any reason) the DATEDIFF will not provide a correct result. COUNTROWS seems to be more reliable in this case.