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Anonymous's avatar
Anonymous
Not applicable
3 years ago
Solved

Including 0 values when calculating STDEV

Hi, Let me walk you through a better example.  I am attempting to determine the most recent 6-Month STDEV for sales by product in order to determine variation.     The Sales Data is made up of dai...
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  • Greg_Deckler's avatar
    Greg_Deckler
    3 years ago

    Anonymous Maybe something like this, PBIX is attached below signature. I'm not getting your stated standard deviation values but I added a debugging measure into the PBIX that should help you determine what is going on. With the debugging measure you can see that it is returning 0's for empty months.

    Measure StdDev = 
    VAR __Date = MAX('Table'[Date])
    VAR __BeginDate = EOMONTH(__Date,-6)
    VAR __EndDate = EOMONTH(__Date, -1)
    VAR __Table = FILTER(ALL('Table'),[Date]>=__BeginDate && [Date]<=__EndDate)
    VAR __Count = COUNTROWS(__Table)
    VAR __Missing = 6 - __Count
    VAR __MissingTable = 
        SELECTCOLUMNS(
            ADDCOLUMNS(
                GENERATESERIES(1,__Missing,1),
                "rmv",0
            ),
            "rmv",[rmv],
            "Date",[Value]
        )
    VAR __FinalTable = UNION(__Table, __MissingTable)
    VAR __Result = STDEVX.P(__FinalTable,[rmv])
RETURN
    __Result

     

Greg_Deckler's avatar
Greg_Deckler
Community Champion
3 years ago

Anonymous I didn't create a calculated table, just a measure. You can share a PBIX file on something like OneDrive or Box and post a link here.

  • Greg_Deckler's avatar
    Greg_Deckler
    Community Champion
    3 years ago

    Anonymous So the Data table should be this?

    Date rmv
    Jun-20 3
    Sep-20 13
    Oct-20 1
    Nov-20 5
    Dec-20 7
    Jan-21 6
    Feb-21 3
    Mar-21 4
    Apr-21 7
    May-21 1
    Jun-21 4
    Jul-21 3
    Aug-21 1
    Sep-21 2
    Oct-21 1
    Nov-21 1
    Dec-21 4
    Jan-22 7