Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
5 years ago

Calculating value differences for each week

I have some 'availability' numbers (a percentage) for a bunch of machines on a weekly basis. My raw CSV data looks like this:

 

 

Machine,WW,Availability
A,WW35,0.9
B,WW35,0.95
C,WW35,1
D,WW35,0.87
A,WW36,1
B,WW36,1
C,WW36,0.84
D,WW36,0.94
A,WW37,0.75
B,WW37,0.98
C,WW37,0.91
D,WW37,0.89
A,WW38,1
B,WW38,0.88
C,WW38,0.99
D,WW38,0.95

 

 

 

Data source is updated weekly and new Work Week (WW) availability data is added for each machine. A machine is deemed 'Pass' if the availability for that week is > 90%. I calculate the 'Pass' measure as below.

 

Pass = 
VAR varCount = CALCULATE(COUNTA(data[Availability]), data[Availability] > 0.9)
RETURN
IF(varCount = BLANK(), 0, varCount)

 

 

Pass count for each machine for each week, displayed in a matrix, looks like this (given above data):

 

Now, I want to calculate some figures for these pass values for each machine. My actual needs are a bit complex, but few of the most basic things I wanted calculated are shown below.

 

  1. New Pass
    Number of total machines for each week that passed, but failed previous week.
  2. New Fail
    Number of total machines for each week that failed, but passed previous week.
  3. Steady
    Number of total machines for each week that the condition didn't change.

To better illustrate, I put my desired results in an Excel file:

 

 

As mentioned at the beginning of the post, my source CSV is updated with new data each week, so as time goes on I will have more [WW] columns added in my PowerBI matrix. Given this I don't quite know how I can calculate the above values dynamically without hardcoding anything. Is this possible?

 

DAX Calculation
Difference

3 Replies

  • mahoneypat's avatar
    mahoneypat
    Microsoft Employee
    5 years ago

    Here is one way to do this one to get the result below.

    First you need to add a column in query or with a DAX column to get the weeknumber as an integer.  You can then use these measure expressions (they differ only in the Return part).  The IF in the Return of the New Pass measure is to prevent a result of 2 showing in WW35.

     

    New Pass =
VAR thisweek =
    MAX ( Availability[WeekNumber] )
VAR summary =
    ADDCOLUMNS (
        VALUES ( Availability[Machine] ),
        "@ThisWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                Availability[WeekNumber] = thisweek
            ) + 0,
        "@LastWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                ALL (
                    Availability[WeekNumber],
                    Availability[WorkWeek]
                ),
                Availability[WeekNumber] = thisweek - 1
            ) + 0
    )
RETURN
    IF (
        thisweek
            = CALCULATE (
                MIN ( Availability[WeekNumber] ),
                ALL ( Availability )
            ),
        BLANK (),
        COUNTROWS (
            FILTER (
                summary,
                [@ThisWeek] - [@LastWeek] = 1
            )
        )
    )

New Fail =
VAR thisweek =
    MAX ( Availability[WeekNumber] )
VAR summary =
    ADDCOLUMNS (
        VALUES ( Availability[Machine] ),
        "@ThisWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                Availability[WeekNumber] = thisweek
            ) + 0,
        "@LastWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                ALL (
                    Availability[WeekNumber],
                    Availability[WorkWeek]
                ),
                Availability[WeekNumber] = thisweek - 1
            ) + 0
    )
RETURN
    COUNTROWS (
        FILTER (
            summary,
            [@ThisWeek] - [@LastWeek] = -1
        )
    )

Steady =
VAR thisweek =
    MAX ( Availability[WeekNumber] )
VAR summary =
    ADDCOLUMNS (
        VALUES ( Availability[Machine] ),
        "@ThisWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                Availability[WeekNumber] = thisweek
            ) + 0,
        "@LastWeek",
            CALCULATE (
                COUNT ( Availability[Machine] ),
                Availability[Availability] > 0.9,
                ALL (
                    Availability[WeekNumber],
                    Availability[WorkWeek]
                ),
                Availability[WeekNumber] = thisweek - 1
            ) + 0
    )
RETURN
    COUNTROWS (
        FILTER (
            summary,
            [@ThisWeek] - [@LastWeek] = 0
                && [@ThisWeek] = 1
        )
    )

     

    Regards,

    Pat

     

    • Anonymous's avatar
      Anonymous
      Not applicable
      5 years ago

      Wow that's pretty complicated. But how do you set a measure as 'Rows' in your Matrix? Power BI won't let me do that.