Thank you so much! I had copied the equation somewhere and didn't realize. It works now!

I've realized that I've enough participants in group 2, but not enough in groups 1, 3, and 4. Is there any way to rewrite
rand(1,4)
to exclude the number 2 and only randomly assign 1, 3, and 4?

Thank you! !

Set the equation to rand(1, 3) and then change the group relevance.

Group 1: randomnumber == '1'
Group 2: randomnumber == '99'
Group 3: randomnumber == '2'
Group 4: randomnumber == '3'