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manojk_pbi's avatar
manojk_pbi
Helper V
2 years ago
Solved

How to write DAX for % change

Hi Friends,   I am looking for a DAX measure to calculate Change in Percentage w.r.t to a particular period by Products. Please suggest me how can we write the optimized DAX for the same. Provided ...
Need Help
  • Anonymous's avatar
    Anonymous
    2 years ago

    Hi manojk_pbi ,

    Please update the formula of measure as below to get it, please find the details in the attachment.

    %Change = 
VAR _MY =
    SELECTEDVALUE ( 'Table'[MY] )
VAR _product =
    SELECTEDVALUE ( 'Table'[Product] )
VAR _preMY =
    CALCULATE (
        MIN ( 'Table'[MY] ),
        FILTER ( ALLSELECTED ( 'Table' ), 'Table'[Product] = _product )
    )
VAR _preqty =
    CALCULATE (
        SUM ( 'Table'[Qty] ),
        FILTER (
            ALLSELECTED ( 'Table' ),
            'Table'[Product] = _product
                && 'Table'[MY] = _preMY
        )
    )
RETURN
    IF (
        _MY = _preMY,
        BLANK (),
        DIVIDE ( SUM ( 'Table'[Qty] ) - _preqty, _preqty )
    )

    Best Regards

lbendlin's avatar
lbendlin
Super User
2 years ago

That is a very, very subjective topic especially when sign changes are involved (like in your case).

 

One approximation is DIVIDE(current-previous, ABS(previous),BLANK())

 

But at the end of the day you have to decide what is a reasonable number in your scenarios.

  • manojk_pbi's avatar
    manojk_pbi
    Helper V
    2 years ago

    Thanks for your input.

     

    I am looking for suggestion on writing measure to calculate % Change .

    • Anonymous's avatar
      Anonymous
      Not applicable
      2 years ago

      lbendlin  Thanks for your contribution on this thread.

      Hi manojk_pbi ,

      lbendlin already gave the related formula. If you want to get the expected result base on your sample data, you can create a measure as below to get it:

      %Change = 
VAR _MY =
    SELECTEDVALUE ( 'Table'[MY] )
VAR _preMY =
    CALCULATE ( MIN ( 'Table'[MY] ), ALLSELECTED ( 'Table' ) )
VAR _preqty =
    CALCULATE (
        SUM ( 'Table'[Qty] ),
        FILTER ( ALLSELECTED ( 'Table' ), 'Table'[MY] = _preMY )
    )
RETURN
    IF (
        _MY = _preMY,
        BLANK (),
        DIVIDE ( SUM ( 'Table'[Qty] ) - _preqty, _preqty )
    )

      Best Regards

      • manojk_pbi's avatar
        manojk_pbi
        Helper V
        2 years ago

        Anonymous , this is perfect. Thanks for the working sample. If i were had to add Product into filter to calculate % Change for each product what changes to be made here ? 

        Pls suggest