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SchmidMatt84's avatar
SchmidMatt84
New Member
1 year ago
Solved

Calculation of difference between two rows

Hi

I need to calcualte the difference between two values which is different depending on a "version"-Value. If its the version "Basis" the difference should be calculated bewtween the years (eg. 2026-2025), if its "V1"-"V2" the calculation should compare it to the "Basis" (eg. V1 - Basis). The differnce should be calculated accoring to this logic:

I've tried several approaches, including an index (Difference). In a Dax-formula I've tried with ALL an FILTER to get the values for the "Difference-Index". But ist not really working within the filter context of a mtraix table, which includes drill-downs with other attributes.

 

Any tipps would be appreciated!

  • FBergamaschi's avatar
    FBergamaschi
    1 year ago

    I think a visual calculation here would be the best approach anyway so I try to solve it immediately using the names in the visual picture you sent

     

    Difference Visual CALC =
    VAR MinYear = MINX ( ROWS, [Jahr] )

    VAR CurrentYear = [Jahr]
    RETURN

    IF (
          [Variante] = "Basis" && CurrentYear <> MinYear && ISATLEVEL ( [Jahr] ), 

          [DVE]- CALCULATE ( [DVE], [Jahr] = CurrentYear -1 ),
          [DVE] - CALCULATE ( [DVE], [Variante] = "Basis" )
    )

     

    If you need to reuse this concept you need a regular measure, in that case refer to my previous post to provide some data

     

    If this helped, please consider giving kudos and mark as a solution

    mein replies or I'll lose your threadconsider voting this Power BI idea

    Francesco Bergamaschi

    MBA, M.Eng, M.Econ, Professor of BI

9 Replies

  • FBergamaschi's avatar
    FBergamaschi
    Super User
    1 year ago

    Hi

    Please include a small rows subset (not an image) of all the tables involved in your request, so that we can import them in Power BI and reproduce the data model (please show it).  Please include also the DAX you wrote so far and the result you get. In this way we can reproduce the scenario and help you. Thank you

    • FBergamaschi's avatar
      FBergamaschi
      Super User
      1 year ago

      I think a visual calculation here would be the best approach anyway so I try to solve it immediately using the names in the visual picture you sent

       

      Difference Visual CALC =
      VAR MinYear = MINX ( ROWS, [Jahr] )

      VAR CurrentYear = [Jahr]
      RETURN

      IF (
            [Variante] = "Basis" && CurrentYear <> MinYear && ISATLEVEL ( [Jahr] ), 

            [DVE]- CALCULATE ( [DVE], [Jahr] = CurrentYear -1 ),
            [DVE] - CALCULATE ( [DVE], [Variante] = "Basis" )
      )

       

      If you need to reuse this concept you need a regular measure, in that case refer to my previous post to provide some data

       

      If this helped, please consider giving kudos and mark as a solution

      mein replies or I'll lose your threadconsider voting this Power BI idea

      Francesco Bergamaschi

      MBA, M.Eng, M.Econ, Professor of BI

      • SchmidMatt84's avatar
        SchmidMatt84
        New Member
        1 year ago

        Thanks, I've tried visual calculations as well. But that doesn't work in combination with field parameters? If there's a possibility to solve it with dax measures, that would be preferable...

      • FBergamaschi's avatar
        FBergamaschi
        Super User
        1 year ago

        My solution with measures

         

        Wert Value = SUM ('10_Total_Merge'[Wert] ) this is the measure I am referring
         
        Wert Delta =
        VAR _Variante = SELECTEDVALUE( '90_Version'[Variante] )
        VAR CurrentYear = SELECTEDVALUE( '90_Version'[Jahr] )
        VAR MinYear = CALCULATE( MIN ( '90_Version'[Jahr] ), REMOVEFILTERS( ) )
        RETURN
        IF (
              _Variante = "Basis" && CurrentYear <> MinYear && ISINSCOPE( '90_Version'[Jahr] ),
              [Wert Value]- CALCULATE ( [Wert Value], '90_Version'[Jahr] = CurrentYear - 1 ),
              [Wert Value] - CALCULATE ( [Wert Value], '90_Version'[Variante] = "Basis" )
        )
         

        If this helped, please consider giving kudos and mark as a solution

        me in replies or I'll lose your threadconsider voting this Power BI idea

        Francesco Bergamaschi

        MBA, M.Eng, M.Econ, Professor of BI