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Hello.

What I'm trying to do is this:

I present 8 questions to the respondents. Then I need to randomly choose 3 of them in order to use their contents for further questions.
for example, lets say I ask how much one consumes each of a list of 8 types of foods, like: bread, meat, eggs, plants, milk and so on.

Then I want to randomly choose 3 of 8 food types and ask about the perceived nutritional value of each type. i.e. I have to use the contents of 3 items selected at random and add it to further questions.

How do I do that?

Thanks,
Efrat.
 

So they respond all 8 initial questions or might there be some that they don't respond?

If they respond to all of them, I would create the 8 corresponding questions later, into 2 question groups. One with 3 questions, one with 5 questions. The one with 5 questions you will hide and you give all these questions the same "randomization group name".

What happens? The 8 questions will appear randomly between the 8 positions, 3 in the first group that is shown, 5 in the second group that will be hidden. This way, you'll always display 3 of the 5 questions at random.

well, it's a bit more complicated than this.
because actually I have 2 series of 8 questions each, and I need to randomly select 3 of each and combine then into 9 (3X3) further questions.

I figured that if I can produce 3 random digits between 1-8 for each series, then I can condition the 9 combinations using these random digits.

I know how to create 1 random digit, using the function rand(1,, but I don't know how to create 3 random digits. can you help me with that?

Thanks a lot.
Efrat.

well, it's a bit more complicated than this.

You should have mentioned this from the beginning then.

You are absolutely right. I wasn't clear enough in my first message.
Still, I hope I can find some solution to my problem.
Thanks.

Please explain a little further what you need from these 3 random digits.

Creating 3 random numbers is easy: Just create a different equation type question for each random number. You should not use {rand(1,} though, because the random number would change everytime you "touch" it. Therefore we recommend with "randnumber" being the question code of the equation question itself, where this code is:

{if(is_empty(randnumber),rand(1,4),randnumber.NAOK)}

But I feel like there is more to it than just creating 2x 3 random numbers. I assume within each set of 3 random numbers you will want them to be unique?

Maybe this helps:  toolsforresearch.com/limesurvey-randomly...of-y-question-groups