topic Re: DAX Help in DAX Commands and Tips

DAX Help

Anonymous — Tue, 26 May 2020 19:10:36 GMT

Hi,

Please help me with Power BI DAX.

I have strugling to create DAX to count total number of Child who has absent 3 or more days every month.

Please help me.

I have attached my cleaned data on this link:

Data Cleaned

Thank you for your help

Re: DAX Help

Anonymous — Tue, 26 May 2020 21:41:43 GMT

The formulation of the problem is not precise. Please give examples of calculations and what you mean by "absent 3 or more days every month" in some contexts.

Best
D

Re: DAX Help

Anonymous — Wed, 27 May 2020 05:57:24 GMT

Hi Anonymous ,

I have updated the pbix please look at attachment and this pictute:

In Values I have added this DAX:

# of Absent = CALCULATE(COUNTA (AttendanceMaster[ChildID], FILTER (AttendanceMaster,AttendanceMaster[IsPresent] = FALSE ()))

I want to measure total ChildID who have values 3 or more days every month. So that I have to created this DAX but does not work.

# of ChildID Absent 3 or more days = CALCULATE(COUNTA (AttendanceMaster[ChildID], FILTER (AttendanceMaster,[# of Absent] >= 3))

Please look at this link:

Data Cleaned

Thank you

Re: DAX Help

Anonymous — Wed, 27 May 2020 08:44:23 GMT

# Child Absent 3+ Days = COUNTROWS( FILTER( VALUES( AttendanceMaster[ChildID] ), CALCULATE( COUNTROWS( AttendanceMaster ) >= 3, KEEPFILTERS( NOT AttendanceMaster[IsPresent] ) ) ) )

Best

Re: DAX Help

Anonymous — Wed, 27 May 2020 08:42:35 GMT

If you don't want to calculate wrong numbers from time to time... you have to change the design into a proper star-schema. Otherwise you're risking incorrect numbers without even knowing it.

If you want to know what can happen when you have just one big table as the model, please read this:

https://www.sqlbi.com/articles/understanding-dax-auto-exist/

Best
D

Re: DAX Help

Anonymous — Wed, 27 May 2020 11:37:30 GMT

Anonymous ,

Thank you. You have found solution for me.

In other case, I have Strugling to calculate total Child who has absent greater than 10% to less than or equal 20%.

Please look at this picture:

In Values, I have created this measure:

# of Absent Child = CALCULATE (COUNTA('AttendanceMaster'[ChildID], 'AttendanceMaster[IsPresent] IN { FALSE })

After that I created this measure too:

# of Child Days = CALCULATE(COUNT('AttendanceMaster'[ChildID]))

Than I created this measure also:

% of Absent Child = CALCULATE(DIVIDE([# of Absent Child],[# of Child Days]))

I want to measure total count of Child who has absent >10% to <=20% every month.

Can you help me again for the last?

I have attach pbix on this link. Please look that data:

Updated Data Cleaned

Thank you for your help

Best

Re: DAX Help

Anonymous — Fri, 29 May 2020 18:26:10 GMT

Hi there.

I've had a look at the file. I think many of those measures are incorrect (and will not work correctly in many filtering conditions) but I might be wrong and from your point of view they are correct. Not sure but my experience tells me they are not right.

However, regardless of the above, I think you're after such a measure:

# Children 10%-20% = COUNTROWS( FILTER( VALUES( AttendanceMaster[ChildID] ), .1 < [% of Absent Child] && [% of Absent Child] <= .2 ) )

If this does not work, you have to create a measure (in place of [% of Absent Child]) that will calculate the percentage of time that a child was absent IN ANY SETTING. Please bear in mind that the measure should work correctly under any circumstances. If it's not, then the calculation is wrong as well.

Hope this helps.

Best