RAND function how to randomly assign to groups

[ahumke]

I'm trying to create a measure that will randomly assign people in my file to a treatment group or a control group if their score is above a threshold.  I've found the RAND command will generate a random number so I was thinking I could do a two step to assign groups.

Random Assignment = if ('Tuesday, July 7, 2020'[Weighted Average Score] > 3, RAND()*(2-1)+1)

Success Coach Assignment = if ('Tuesday, July 7, 2020'[Random Assignment] <1.50, "Yes")

This doesn't seem to be working though - each time I run the "Student Coach Assignment" field it seems to rerun the random assignment field - therby doing the Success Coach Assignment on the prior run values (meaning the assignment rule isn't followed) and the other problem is that once a person is assigned a value I don't want it to change for that person. The data will get updated and refreshed periodically to add people but the individual person should remain the same and I don't want their values to change at all.

Is there a way to make it work that way?

Thanks!

[harshnathani]

Hi @ahumke ,

You can try this 

Random Assignment =
IF (
    'Tuesday, July 7, 2020'[Weighted Average Score] > 3,
    DIVIDE (
        'Tuesday, July 7, 2020'[Weighted Average Score],
        100
    ) * ( 2 - 1 ) + 1
)

Regards,

Harsh Nathani

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[amitchandak]

@ahumke , Random function changes values with every load. You need to find a better way.

Maybe create a RANk and divide my max Rank +1

For Rank Refer these links
https://radacad.com/how-to-use-rankx-in-dax-part-2-of-3-calculated-measures
https://radacad.com/how-to-use-rankx-in-dax-part-1-of-3-calculated-columns
https://radacad.com/how-to-use-rankx-in-dax-part-3-of-3-the-finale
https://community.powerbi.com/t5/Community-Blog/Dynamic-TopN-made-easy-with-What-If-Parameter/ba-p/3...

[edhans]

Consider using List.Random inside of Power Query. It will only update on the refresh of the dataset, not as users are working in the report. Here is an article that shows how to do that.