topic Re: Calculating value differences for each week in DAX Commands and Tips

Calculating value differences for each week

Anonymous — Mon, 28 Sep 2020 23:43:59 GMT

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.

New Pass
Number of total machines for each week that passed, but failed previous week.
New Fail
Number of total machines for each week that failed, but passed previous week.
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?

Re: Calculating value differences for each week

dedelman_clng — Fri, 02 Oct 2020 13:23:15 GMT

Hi Anonymous - this might be better off doing a PowerQuery/M creation of columns showing this week's Pass/Fail and Last Week's Pass/Fail. May want to post in that forum.

ImkeF
vanessafvg
tex628
mahoneypat
edhans

David

Re: Calculating value differences for each week

mahoneypat — Fri, 02 Oct 2020 18:38:59 GMT

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

Re: Calculating value differences for each week

Anonymous — Tue, 06 Oct 2020 17:54:21 GMT

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.