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pfarahani's avatar
pfarahani
Helper II
5 years ago
Solved

Calculate Percentage Change from Previous Row

Hello,

 

I am trying to create a DAX measure to get the Percentage Change from Month to Month. Problem is I do not have a traditional Dates table, my Dates table is more like a String table with Dates. 

 

Here is the visual i am trying to create:

-- The number of filings in here is a simple measure, and then I use a domension table to get the court names, and then i use my dates dimension (not really a dates table) to get the Year month

 

 

I want another column that has percentage change showing., but I cant use PREV MONTH syntax for the measure because my dates table is not marked Dates. 

 

What I did in my dates table, I created a Index, so that at least I can Rank my row to get the dates in order:

 

 Thanks

 

 

Need Help
  • amitchandak's avatar
    amitchandak
    5 years ago

    pfarahani , Try like this example , Date here us your Month year table

     

     

    This Month = CALCULATE(sum('order'[Qty]), FILTER(ALL('Date'),'Date'[index]=max('Date'[index])))
    Last Month = CALCULATE(sum('order'[Qty]), FILTER(ALL('Date'),'Date'[index]=max('Date'[index])-1))

     

    diff = [This Month]-[Last Month]
    diff % = divide([This Month]-[Last Month],[Last Month])

3 Replies

  • amitchandak's avatar
    amitchandak
    Super User
    5 years ago

    pfarahani , Try like this example , Date here us your Month year table

     

     

    This Month = CALCULATE(sum('order'[Qty]), FILTER(ALL('Date'),'Date'[index]=max('Date'[index])))
    Last Month = CALCULATE(sum('order'[Qty]), FILTER(ALL('Date'),'Date'[index]=max('Date'[index])-1))

     

    diff = [This Month]-[Last Month]
    diff % = divide([This Month]-[Last Month],[Last Month])

    • pfarahani's avatar
      pfarahani
      Helper II
      5 years ago

      amitchandak , worked out pretty nice i think, 1 small issue remains. Below is the chart, not bad, however my data ends with December 2019, but its still trying to calculate for the January 2020. Is their a solution using ISBLANK or an IF to stop after Dec 2019. thanks 

       

       

      • pfarahani's avatar
        pfarahani
        Helper II
        5 years ago

        amitchandak I think I got something here, 

        I took the code you provided for diff% and modify to this:

        diff % = IF( ISBLANK('_Measures Table'[This Month])
        , BLANK(), DIVIDE([This Month]-[Last Month],[Last Month]))
         
        Seems to work nice. One more question, the part i circled at the top, what is it calculating there? thanks