Forum Discussion

IMK's avatar
IMK
Helper I
9 years ago
Solved

Need help with null cells

I am calculating NPS with Power BI and created a new column for this. I have Grades column that holds grades given by customer and I ma creating new column which looks at the grade in Grade column and changes the grade to either Detractors, Passives or Promoters.

 

My problem is that some cells in Grades column may be empty. Now my syntax counts these empty cells as Detractors but it should count it as "Empty". How can I get the syntax to count empty cells as empty cells??

 

Column = SWITCH(TRUE();'Table1'[Grades]>=0 && 'Table1'[Grades]<=6;"Detractors";'Table1'[Grades]=7 ||'Table1'[Grades]=8; "Passives";'Table1'[Grades]=9 || 'Table1'[Grades]=10;"Promoters"; "Empty")

 

 

Need Help
  • Sean's avatar
    Sean
    9 years ago

    IMK

    This is happening because the empty values are treated as zeros and falling into the first condition

    There's couple ways you can handle this depending on whether 0 is actually a legitimate value or not.

    (meaning could you really have a zero as a grade)

    So if zero can't be really a value all you have to change is the comparison from >= 0 to just > 0

    Column 2 =
SWITCH (
    TRUE ();
    'Table1'[Grades] > 0
        && 'Table1'[Grades] <= 6; "Detractors";
    'Table1'[Grades] = 7
        || 'Table1'[Grades] = 8; "Passives";
    'Table1'[Grades] = 9
        || 'Table1'[Grades] = 10; "Promoters";
    "Empty"
)

    Now if zero can in fact be a grade use this instead which first checks if the value is blank

    Column 3 =
IF (
    ISBLANK ( 'Table1'[Grades] );
    "Empty";
    SWITCH (
        TRUE ();
        'Table1'[Grades] >= 0
            && 'Table1'[Grades] <= 6; "Detractors";
        'Table1'[Grades] = 7
            || 'Table1'[Grades] = 8; "Passives";
        'Table1'[Grades] = 9
            || 'Table1'[Grades] = 10; "Promoters"
    )
)

    Hope this helps! :smileyhappy:

  • Sean's avatar
    Sean
    9 years ago

    When you say SUM I suspect you mean COUNT each category and the overall total excluding the "empty" values

    So to calculate each category individually...

    Detractors =
CALCULATE (
    COUNTA ( Table1[Column 3] );
    FILTER ( 'Table1'; 'Table1'[Column 3] = "Detractors" )
)

Passives =
CALCULATE (
    COUNTA ( Table1[Column 3] );
    FILTER ( 'Table1'; 'Table1'[Column 3] = "Passives" )
)

Promoters =
CALCULATE (
    COUNTA ( Table1[Column 3] );
    FILTER ( 'Table1'; 'Table1'[Column 3] = "Promoters" )
)

    Then to calculate the overall total - couple ways depending on which column you decide to FILTER

    Total (NonBlank) =
CALCULATE (
    COUNTA ( Table1[Grades] );
    FILTER ( Table1; Table1[Grades] <> BLANK () || Table1[Grades] = 0 )
)

Total (NonBlank) 2 =
CALCULATE (
    COUNTA ( Table1[Grades] );
    FILTER ( Table1; Table1[Column 3] <> "Empty" )
)

    If you FILTER the [Grades] column as in the first formula you have to exclude blanks but include zeros

    If you FILTER [Column 3] instead all you have to exclude is "Empty" since we already took care of this in the [Column 3] formula

    Hope this helps! :smileyhappy:

5 Replies

  • Sean's avatar
    Sean
    Community Champion
    9 years ago

    IMK

    This is happening because the empty values are treated as zeros and falling into the first condition

    There's couple ways you can handle this depending on whether 0 is actually a legitimate value or not.

    (meaning could you really have a zero as a grade)

    So if zero can't be really a value all you have to change is the comparison from >= 0 to just > 0

    Column 2 =
SWITCH (
    TRUE ();
    'Table1'[Grades] > 0
        && 'Table1'[Grades] <= 6; "Detractors";
    'Table1'[Grades] = 7
        || 'Table1'[Grades] = 8; "Passives";
    'Table1'[Grades] = 9
        || 'Table1'[Grades] = 10; "Promoters";
    "Empty"
)

    Now if zero can in fact be a grade use this instead which first checks if the value is blank

    Column 3 =
IF (
    ISBLANK ( 'Table1'[Grades] );
    "Empty";
    SWITCH (
        TRUE ();
        'Table1'[Grades] >= 0
            && 'Table1'[Grades] <= 6; "Detractors";
        'Table1'[Grades] = 7
            || 'Table1'[Grades] = 8; "Passives";
        'Table1'[Grades] = 9
            || 'Table1'[Grades] = 10; "Promoters"
    )
)

    Hope this helps! :smileyhappy:

    • IMK's avatar
      IMK
      Helper I
      9 years ago

      Hi

       

      Thanks for you'r answer!! Zero can indeed be a grade so I will use the second syntax, which works great! Thanks!

       

      Just one thing more.. I would need to be able to calculate the sum of Detractors, Passives and Promoters but cells marked as Empty should not be calculated to the sum. 

       

      How can I do this?

       

      After I get this sorted, I am ready to publish the ready syntax to calculate NPS score using Power BI.

      • Sean's avatar
        Sean
        Community Champion
        9 years ago

        When you say SUM I suspect you mean COUNT each category and the overall total excluding the "empty" values

        So to calculate each category individually...

        Detractors =
CALCULATE (
    COUNTA ( Table1[Column 3] );
    FILTER ( 'Table1'; 'Table1'[Column 3] = "Detractors" )
)

Passives =
CALCULATE (
    COUNTA ( Table1[Column 3] );
    FILTER ( 'Table1'; 'Table1'[Column 3] = "Passives" )
)

Promoters =
CALCULATE (
    COUNTA ( Table1[Column 3] );
    FILTER ( 'Table1'; 'Table1'[Column 3] = "Promoters" )
)

        Then to calculate the overall total - couple ways depending on which column you decide to FILTER

        Total (NonBlank) =
CALCULATE (
    COUNTA ( Table1[Grades] );
    FILTER ( Table1; Table1[Grades] <> BLANK () || Table1[Grades] = 0 )
)

Total (NonBlank) 2 =
CALCULATE (
    COUNTA ( Table1[Grades] );
    FILTER ( Table1; Table1[Column 3] <> "Empty" )
)

        If you FILTER the [Grades] column as in the first formula you have to exclude blanks but include zeros

        If you FILTER [Column 3] instead all you have to exclude is "Empty" since we already took care of this in the [Column 3] formula

        Hope this helps! :smileyhappy: