cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
Gingerjeans88
Helper III
Helper III

DAX Measure help! % calculation

Hello hello helpful folk, 

 

I need a little help with a measure. 
I'll give you the high level requirement then explain table structure:

 

I need to be able to calculate the % of college applicants who attended a careers day before they applied. 
Every student has a Student record in the Student table [StudentId], which is related to the Applications table [StudentValueID] by a 1:N relationship. They can have multiple but mostly just have one, and we're concerned with their first application anyhow. 
Their attendance at a Careers Day is recorded by an Event Response record with a [Type] of 'Careers Day', these responses are child records of an Events table (1:N). 

Essentially - I want to see the percentage of students with an event response, where the event response date is earlier than the date of their application. 

Can provide visuals of table structure if needed but hopefully the above is explanatory enough! 

1 ACCEPTED SOLUTION
mahoneypat
Super User IV
Super User IV

Here is one way to approach this one

 

% Students Career Day First =
VAR __summarytable =
    ADDCOLUMNS (
        VALUES ( Students[StudentID] ),
        "@AppDate", CALCULATE ( MIN ( Applications[Date] ) ),
        "@MinCareerDay", CALCULATE ( MIN ( Events[Date] ), Events[Type] = "Careers Day" )
    )
RETURN
    DIVIDE (
        COUNTROWS ( FILTER ( __summarytable, [@MinCareerDay] < [@AppDate] ) ),
        COUNTROWS ( __summarytable )
    )

 

If this works for you, please mark it as the solution.  Kudos are appreciated too.  Please let me know if not.

Regards,

Pat





Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

To learn more about Power BI, follow me on Twitter or subscribe on YouTube.


@mahoneypa HoosierBI on YouTube


View solution in original post

5 REPLIES 5
Ashish_Mathur
Super User III
Super User III

Hi,

Share data in a format that can be pasted in an Excel file.


Regards,
Ashish Mathur
http://www.ashishmathur.com
https://www.linkedin.com/in/excelenthusiasts/
mahoneypat
Super User IV
Super User IV

Here is one way to approach this one

 

% Students Career Day First =
VAR __summarytable =
    ADDCOLUMNS (
        VALUES ( Students[StudentID] ),
        "@AppDate", CALCULATE ( MIN ( Applications[Date] ) ),
        "@MinCareerDay", CALCULATE ( MIN ( Events[Date] ), Events[Type] = "Careers Day" )
    )
RETURN
    DIVIDE (
        COUNTROWS ( FILTER ( __summarytable, [@MinCareerDay] < [@AppDate] ) ),
        COUNTROWS ( __summarytable )
    )

 

If this works for you, please mark it as the solution.  Kudos are appreciated too.  Please let me know if not.

Regards,

Pat





Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

To learn more about Power BI, follow me on Twitter or subscribe on YouTube.


@mahoneypa HoosierBI on YouTube


View solution in original post

Hi Pat @mahoneypat 

 

You are a star, thank you! However - the Event Date is on the Event, and I need to return the Students with an Event Responses where the related Event's date is before the earliest application date. I'm not sure the @ MinOpenDay is doing this? What do you think?

I have, however, pulled the related Event's date onto each Event Response with a calculated column, so I now have:

 

Event Responses [Event Date] as a calculated column,

as well as Students[EarliestApplicationDate] to avoid needing to evaluate across all Students' application records. This could simplify the measure but wouldn't work as well with a summary table no?

I think it is doing that comparison in the filter part in the return statement. Please let me know if you are getting incorrect results.

Regards

Pat

 





Did I answer your question? Mark my post as a solution! Kudos are also appreciated!

To learn more about Power BI, follow me on Twitter or subscribe on YouTube.


@mahoneypa HoosierBI on YouTube


Gingerjeans88
Helper III
Helper III

Quick clarification /amendment because of a typo:

*Essentially I want to see the percentage of students with a Careers Day event response, where the careers day event response date is earlier than the date of their application. 

 

Helpful resources

Announcements
User Groups Public Preview

Join us for our User Group Public Preview!

Power BI User Groups are coming! Make sure you’re among the first to know when user groups go live for public preview.

March Update

Check it Out!

Click here to read more about the March 2021 Updates!

secondImage

The largest Power BI virtual conference

100+ sessions, 100+ speakers, Product managers, MVPs, and experts. All about Power BI. Attend online or watch the recordings.