Random selection

How can I select a random item from a list question (without creating a roster)?

A linked question filtered by @rowcode>(int)Math.Floor(NUMBEROFITEMS*Quest.IRnd())+1 could work in theory, but I could not find a function counting NUMBEROFITEMS.

Any alternative suggestions?

Create a string variable named selected defined as:
where ml is the name of the members list question.

Then add a static text:

“Interviewer, continue the rest of the interview with %selected%.”

Enable the remaining questions only when ml.Count()>0