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TOPIC: randomly assign participants to groups

randomly assign participants to groups 1 year 7 months ago #94040

Hi,
I try to create something that will assign participants randomly to one of 4 groups, but I don't get it to work.

I work with LS 1.91, so I cannot add "question type equation". I have found some solutions, but I run into problems, so I think I make a mistake somewhere.

The following script I adjusted from another forum post (which can be found here www.limesurvey.org/en/forum/can-i-do-thi...-the-others?start=10)

<script type="text/javascript">
<!--
$(document).ready(function()
{
// Find a random number between 1 and 4
var randNumber = Math.floor(Math.random()*3 + 1);
$('input#answer96682X129523X1961293').val(randNumber);
checkconditions(randNumber,'96682X129523X1961293','text');
})
//-->
</script>

where 96682 is Survey ID, 129523 is Group ID, 1961293 is Question ID)

In the next question group I created 4 questions, and depending on the random "answer" participants would get one of the 4 questions (by adding the condition "answer to 'random' question equals 1" --> question 1; "...equals 2" --> question 2, etc.). This seems to work.

When I try to hide this question, however, it does no longer work (the question is hidden, but the questions following this question are not shown either).

Also, if I have 4 groups, is the "Math.floor(Math.random()*3 + 1)" correct, or should it be "Math.floor(Math.random()*4 + 1)" (as is shown in the link below). And are the random numbers obtained than 1 2 3 and 4 or 0 1 2 and 3? I have tested the above solution a number of times, but only got 1 2 or 3 as a response. Not sure if that is just coincidence, or that I actually only create those 3 numbers.

This is another solution that I found, but it did not work for me:
docs.limesurvey.org/tiki-index.php?page=...rol_survey_behaviour

I hope someone can help!
Many thanks in advance!
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randomly assign participants to groups 1 year 7 months ago #94058

  • DenisChenu
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Hello,

With 2.0 (or 1.92), you can use directly:
{rand(1,4)} in an equation question type.

Denis
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randomly assign participants to groups 1 year 7 months ago #94060

Thanks Denis,
Unfortunately, I work (via university server) with version 1.91, and don't have that option.
Any thoughts on how to solve this in 1.91?

Jolanda
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randomly assign participants to groups 1 year 7 months ago #94079

  • tpartner
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When I try to hide this question, however, it does no longer work...
You cannot hide the question with the advanced question setting, You need to hide it with JavaScript:
$('#question96682X129523X1961293').hide();
or with CSS
#question96682X129523X1961293 { display: none; }

Also, if I have 4 groups, is the "Math.floor(Math.random()*3 + 1)" correct, or should it be "Math.floor(Math.random()*4 + 1)"...
To get a random number between 1 and 4, use
Math.floor(Math.random()*4)+1
Cheers,
Tony Partner

Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.

LimeSurvey is open-source and run entirely by volunteers so please consider donating to support the project.
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randomly assign participants to groups 1 year 7 months ago #94081

Thanks Tony!
I included the code for hiding the question in my javascript source, but it keeps showing the question...? Do you see the mistake in the code?

The source code that I have now is:
<script type="text/javascript">
<!--
$(document).ready(function()
{
// Find a random number between 1 and 4
var randNumber = Math.floor(Math.random()*4 + 1);
$('input#answer96682X129523X1961293').val(randNumber);
checkconditions(randNumber,'96682X129523X1961293','text');
$('#question96682X129523X1961293').hide();
})
//-->
</script>

Thanks!
Jolanda.
Last Edit: 1 year 7 months ago by DenisChenu. Reason: [code type=javascript]
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randomly assign participants to groups 1 year 7 months ago #94086

  • DenisChenu
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Thinks it's $('#question96682').hide(); :)
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randomly assign participants to groups 1 year 7 months ago #94088

Yes! That works, great!!
It still shows the page of the question, but if I add this question to another group, people won't notice.

Thanks!
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randomly assign participants to groups 1 year 7 months ago #94089

  • tpartner
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Oops, sorry, moving too fast...

I think it should be :
$('#question1961293').hide();

Or CSS:
#question1961293 { display: none; }


(Assuming the question ID is 1961293)
Cheers,
Tony Partner

Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.

LimeSurvey is open-source and run entirely by volunteers so please consider donating to support the project.
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The following user(s) said Thank You: DenisChenu, jvandernoll

randomly assign participants to groups 1 year 2 weeks ago #100605

Hi again,
following my earlier question - Now try to do the same with three conditional groups. I adjusted the code I used before (see below) to this:

<script type="text/javascript">
<!--
$(document).ready(function()
{
// Find a random number between 1 and 3
var randNumber = Math.floor(Math.random()*3 + 1);
$('input#answer96682X129523X1961293').val(randNumber);
checkconditions(randNumber,'96682X129523X1961293','text');
$('#question96682X129523X1961293').hide();
})
//-->
</script>

but this does not work. Can you spot the mistake?

Many thanks!
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randomly assign participants to groups 11 months 2 weeks ago #101344

  • cecilia
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Please, could you send me a copy of a survey applying the discussed function? I have access to LS 1.91+ from my University. I have changed the js template but I cannot use the question with the random number in conditional format. Thanks!
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