Hello All,I have two groups of questions, Group A (A1, A2,…, A90) and Group B (B1, B2, …,B90), where each question in Group A is paired with a question in group B (i.e. Ax is related to Bx). I want to randomly display 10 pairs of questions (i.e. 10 from A and their corresponding pair that has the same number from B ), however, I do not want to show the pairs in a consecutive manner but rather randomly. For example, I want to show (A1, B3, A5, B1, B5, A3 ..) and not (A1, B1, A5, B5, B3, A3 …). I will be thankful if you can guide me on how to go on about it.
Many thanks!
Moath

Hi,
more or less the same procedure as shown here
[url] forums.limesurvey.org/forum/can-i-do-thi...-each-question-group [/url]

Create a question of type "short text" ("Q0") with this javascript snippet in the question text (source code mode).
Here you select ten random numbers out of your ninety.

You will get something like
#12,02,54,78,23,66,13,45,76,28

Now the relevance equation of each pair of questions is "Does the string contain this number?"
Function "strpos"

Question A1: strpos(Q0,"01")>0
Question B1: strpos(Q0,"01")>0
Question A2: strpos(Q0,"02")>0
Question B2: strpos(Q0,"02")>0
...
Question A34: strpos(Q0,"34")>0
Question B34: strpos(Q0,"34")>0
...
Question A90: strpos(Q0,"90")>0
Question B90: strpos(Q0,"90")>0

All questions have the same randomization group name.

Joffm

Thank you for your prompt response, you are a life savior! Just to double check, does this also take care of randomizing the questions so that the pairs will not be displayed right after each others?

Using the example you gave with #12,02,54,78,23,66,13,45,76,28, would the questions appear in consecutive pairs (i.e. A12, B12, A02, B02, etc.) or randomly (e.g. A12, B78, A02, B12, etc.)

Thank you again!

Hi,
There are two answers to this question:

1. Did you try? 

2. Did you read the manuual about question types, especially this?
[url] www.limesurvey.org/manual/Question_type_...e_.28random_group.29 [/url]

All questions have the same randomization group name.

Joffm

Thank you again for replying and for the link. I tried the solution with a smaller set of questions (A1-4 and B1-4) and the randomization works perfectly, so many thanks for that! However, the only issue I faced when I previewed the survey is that when I want to choose 2 pairs out of these 4 pairs, sometimes I get 1 pair, sometimes I get exactly 2 as I wanted and sometimes 3 so I am not sure why this is happening..

I edited the code you provided as following:

<script type="text/javascript" charset="utf-8">
 
function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex;
 
  // While there remain elements to shuffle...
  while (0 !== currentIndex) {
 
    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;
 
    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }
 
  return array;
}
 
 
    $(document).on('ready pjax:scriptcomplete',function(){
// Fill the array
      var arr = [];
      for (var i = 1; i < 9; i++)
      {
         w=("00" + i).slice(-2); arr.push(w);
      }
 
      arr = shuffle(arr);
      anumbers = arr.slice(0,4).join(',');
      $('#question{QID} input[type="text"]').val("#"+anumbers);
      $('#question{QID}').hide();
      $('#ls-button-submit').trigger('click');      
   });
</script>

I am not sure if I edited the code properly..

Many thanks!

Hi,

    for (var i = 1; i < 9; i++)
      {
         w=("00" + i).slice(-2); arr.push(w);
      }

So you get a initial array of:
"01","02","03","04","05","06","07","08","09"
This is obviously not what you want to have; you only have 4 questions.

Well, this array with 9 elements is shuffled.
Then

  anumbers = arr.slice(0,4).join(',');

This means you select the first 4 elements out of these 9.
You might get something like
#08,01,07,06
But you only want to have 2.

So only one question will be displayed with the relevance equation strpos(Q0,"01")>0
There will be no questions with "strpos(Q0,"08")>0", or are there.

To correct your example with 2 out of 4 you  should set:

      for (var i = 1; i < 5; i++)
      {
         w=("00" + i).slice(-2); arr.push(w);
      }
 
      arr = shuffle(arr);
      anumbers = arr.slice(0,2).join(',');

So you get an initial array of "01","02","03","04"
and after shuffling and slicing two random elements like "#03,01"

Please, read some basics about this:
[url] www.w3schools.com/jsref/jsref_push.asp [/url]
[url] www.w3schools.com/jsref/jsref_slice_array.asp [/url]

Joffm