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NuTek's avatar
NuTek
Frequent Visitor
9 years ago
Solved

Calculating overlap between selected groups

Given the following table and data:

 

Group     Task
=====     ====
XYZ        A
XYZ        C
XYZ        D
XYZ        E
PDQ        B
PDQ        C
PDQ        D
PDQ        E
LUV        G
LUV        H

 
I'd like to create a Matrix showing the count of the overlap of two selected groups (XYZ, PDQ) assigned to the same task:
 

        Group   Group
Task    XYZ     PDQ      Overlap
A        1       0          1
B        0       1          1
C        1       1          2
D        1       1          2
E        1       1          2
------------------ ===========
                   Overlap: 3

 
And then have a card (or other visual) displaying the Percent overlap between the two selected groups:

Group XYZ:   75%       ( 3 overlapping out of 4)


Is this possible in Power BI?  
In Excel I can just do a CountIf() on the Overlap column, but I'm not sure how to achieve this in Power BI

Need Help
  • v-ljerr-msft's avatar
    v-ljerr-msft
    9 years ago

    Hi NuTek,

     

    You can use FIRSTNONBLANK/LASTNONBLANK function to get the first/last selected group.

    First Selected Group = FIRSTNONBLANK(Table1[Group],1)

    The formula below is for your reference.:smileyhappy:

    % Overlap for first Selected Group =
VAR firstSelectedGroup =
    FIRSTNONBLANK ( Table1[Group], 1 )
VAR count_of_overlap =
    CALCULATE (
        DISTINCTCOUNT ( Table1[Task] ),
        FILTER (
            Table1,
            CALCULATE ( COUNT ( Table1[Task] ), ALLSELECTED ( Table1[Group] ) ) = 2
        )
    )
        + 0
VAR count_of_task_XYZ =
    CALCULATE (
        DISTINCTCOUNT ( 'Table1'[Task] ),
        'Table1'[Group] = firstSelectedGroup
    )
        + 0
RETURN
    DIVIDE ( count_of_overlap, count_of_task_XYZ, 0 )

    Regards

6 Replies

  • Sean's avatar
    Sean
    Community Champion
    9 years ago

    Shouldn't your example give 3/5 or 60% ?

     

    If so this Measure should do it... :smileyhappy:

     

    % Overlap =
DIVIDE (
    CALCULATE (
        DISTINCTCOUNT ( 'Table'[Group] ),
        ALLEXCEPT ( 'Table', 'Table'[Task] )
    ),
    DISTINCTCOUNT ( 'Table'[Task] ),
    0
)

    • NuTek's avatar
      NuTek
      Frequent Visitor
      9 years ago

      Thanks for the fast reply :)

       

      The number I'm looking for is the number of "2"'s in the "Overlap" column divided by the number of rows with a "1" in the Group columns.   ex: Group XYZ has 4 tasks (A,C,D,E) with 3 tasks appearing in both Group XYZ and PDQ (there are 3 columns in Overlap  with a "2")

       

      Will try yo play with the solution you provided.

       

      Thanks!

       

       

      • Sean's avatar
        Sean
        Community Champion
        9 years ago

        NuTek

         

        You can always hardcode XYZ in the formula

         

        % Overlap for XYZ = 
DIVIDE (
    CALCULATE (
        DISTINCTCOUNT ( 'Table'[Group] ),
        ALLEXCEPT ( 'Table', 'Table'[Task] )
    ),
    CALCULATE ( DISTINCTCOUNT ( 'Table'[Task] ), 'Table'[Group]="XYZ" ),
    0
)

        Hope this helps! :smileyhappy: