Qualtrics: Evenly present field elements of a loop across participants

Question

I'm currently working on a Qualtrics survey in which respondents have to rate pictures on a couple of characteristics.

Given that it's a lot of pictures (300), participants shouldn't have to rate all of them but can choose to exit once they've had enough. I used this solution to allow participants to exit the loop and subsequently the study.

Problem: I need a certain number of ratings for each picture, say 30.

Is it possible to put a limit on how many times a picture is presented in a loop, after which this particular picture is left out for subsequent participants? Alternatively, it might also suffice to have an "present evenly" option for the loop elements, but I can't find it.

Is there a way to use JavaScript to achieve this? Or is there an option in Qualtrics that could do the trick?

Thank you in advance!

Answer 1

You can use 'present evenly' on loop elements by adding a MC question prior to the loop with all your loop elements as choices. Use Advanced Randomization with 'evenly present' on the question and hide the question with JS. Then base your loop off the displayed choices in the hidden question.

If you want to set a limit on each loop element you can create a quota for each element and create a hidden MC question like above. Add choice display logic to the MC question based on whether the choices' quotas have been met.