Hello,
I am currently creating my first survey in LimeSurvey, and I have one problem.

My survey has 4 groups of questions: 1st and 4th group will be standard & displayed to all participants, while 2nd and 3rd group should be randomized in a way that some participants should see only 2nd group of questions (without 3rd group of questions), and the other random participants should have displayed only 3rd group of questions (without 2nd). 

Is it possible to arrange it in LimeSurvey? I tried via "Randomization group", but it only changes that group 2nd and 3rd are both displayed in a random order, while I wish to have randomly displayed either group 2nd either group 3rd.

Thank you in advance for any suggestions!

I tried via "Randomization group"

Yes, this is the wrong approach.
You use "randomization group " to display ALL questions/groups in randomized order.
You have to use a random number. (1-2) to display ONE randomly selected question/group out of n.

So, create a random number in a question of type "equation"
Like {if(is_empty(randnbr),rand(1,2),randnbr)}
and set the condition of your groups.
Either randnbr==1
or randnbr==2

Joffm

 

Hello Joffm,

Thanks a lot for your reply!

So, if I understand well:
1. For each question of the 2 groups, I need to set each question type as "equation".
2. As condition set this: {if(is_empty(randnbr),rand(1,2),randnbr)}
3. In "Equation" set  randnbr==1 or randnbr==2

Is that correct? I just tried and unfortunately nothing has changed, still both groups of questions are displayed.

Any advice? Big thanks in advance!

So, create a random number in a question of type "equation"
Like {if(is_empty(randnbr),rand(1,2),randnbr)}

Of course the question code has to be "randnbr".
Now your variable "randnbr" will be either equal 1 or equal 2.

and set the condition of your groups.
Either randnbr==1
or randnbr==2

What is a condition?
A condition os a logical term that can be TRUE or FALSE.
If TRUE the group / question / subquestion is displayed, if FALSE not.

Now if you set the condition of group 1 to "randnbr==1" this group is only displayed if "randnbr" has the value "1"

Joffm