# randomly assign participants to groups

5 Jahre 9 Monate her #94040 von jvandernoll
jvandernoll erstellte das Thema randomly assign participants to groups
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">
<!--
{
// Find a random number between 1 and 4
var randNumber = Math.floor(Math.random()*3 + 1);
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!

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5 Jahre 9 Monate her #94058 von DenisChenu
DenisChenu antwortete auf das Thema: randomly assign participants to groups
Hello,

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

Denis

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member, professional service on demand (or search sondages pro).
An error happen ? Before make a new topic : remind the Debug mode .

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5 Jahre 9 Monate her #94060 von jvandernoll
jvandernoll antwortete auf das Thema: randomly assign participants to groups
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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5 Jahre 9 Monate her #94079 von tpartner
tpartner antwortete auf das Thema: randomly assign participants to groups

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.

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5 Jahre 9 Monate her - 5 Jahre 9 Monate her #94081 von jvandernoll
jvandernoll antwortete auf das Thema: randomly assign participants to groups
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">
<!--
{
// Find a random number between 1 and 4
var randNumber = Math.floor(Math.random()*4 + 1);
checkconditions(randNumber,'96682X129523X1961293','text');
\$('#question96682X129523X1961293').hide();
})
//-->
</script>```

Thanks!
Jolanda.
Letzte Änderung: 5 Jahre 9 Monate her von DenisChenu. Begründung: [code type=javascript]

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5 Jahre 9 Monate her #94086 von DenisChenu
DenisChenu antwortete auf das Thema: randomly assign participants to groups
Thinks it's \$('#question96682').hide();

Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
I'm not a LimeSurvey GmbH member, professional service on demand (or search sondages pro).
An error happen ? Before make a new topic : remind the Debug mode .

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5 Jahre 9 Monate her #94088 von jvandernoll
jvandernoll antwortete auf das Thema: randomly assign participants to groups
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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5 Jahre 9 Monate her #94089 von tpartner
tpartner antwortete auf das Thema: randomly assign participants to groups
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.
Folgende Benutzer bedankten sich: DenisChenu, jvandernoll

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5 Jahre 3 Monate her #100605 von jvandernoll
jvandernoll antwortete auf das Thema: randomly assign participants to groups
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">
<!--
{
// Find a random number between 1 and 3
var randNumber = Math.floor(Math.random()*3 + 1);
checkconditions(randNumber,'96682X129523X1961293','text');
\$('#question96682X129523X1961293').hide();
})
//-->
</script>

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

Many thanks!

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5 Jahre 2 Monate her #101344 von cecilia
cecilia antwortete auf das Thema: randomly assign participants to groups
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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5 Jahre 2 Monate her #101488 von jvandernoll
jvandernoll antwortete auf das Thema: randomly assign participants to groups
Hi Cecilia,
If you go to your question, you should include the code below in your source code (click source)
- This is for 4 conditions;
- you have to adjust the SurveyIdXGroupIdXQuestionId to correspond with your own Id-numbers (leave the X between the Id-numbers);
- and the last line \$('#question1979503').hide(); is to hide the question with question Id number 1979503 -- you need to adjust this too to correspond with your question ID

Hope this helps!

Here's the code:

<script type="text/javascript">
<!--
{
// Find a random number between 1 and 4
var randNumber = Math.floor(Math.random()*4 + 1);
checkconditions(randNumber,'SurveyIdXGroupIdXQuestionId','text');
\$('#question1979503').hide();
})
//-->
</script>

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