# TOPIC: randomly assign participants to groups

## randomly assign participants to groups 2 years 8 months ago #94040

 jvandernoll Offline Fresh Lemon Posts: 12 Karma: 0 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) 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! The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94058

 DenisChenu Offline Moderator Lime Posts: 7892 Thank you received: 1081 Karma: 314 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 developpement are on my free time (Say thanks ?). A bug not reported is a bug not corrected. | Please, read the documentation | La doc en français à besoin de vous Official LimeSurvey Partner | Web development | SkeletonQuest, RWD for LimeSurvey The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94060

 jvandernoll Offline Fresh Lemon Posts: 12 Karma: 0 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 The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94079

 tpartner Online LimeSurvey Team Posts: 5276 Thank you received: 1101 Karma: 458 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. The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94081

 jvandernoll Offline Fresh Lemon Posts: 12 Karma: 0 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: `````` Thanks! Jolanda. Last Edit: 2 years 8 months ago by DenisChenu. Reason: [code type=javascript] The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94086

 DenisChenu Offline Moderator Lime Posts: 7892 Thank you received: 1081 Karma: 314 Thinks it's \$('#question96682').hide(); Assistance on LimeSurvey forum and LimeSurvey core developpement are on my free time (Say thanks ?). A bug not reported is a bug not corrected. | Please, read the documentation | La doc en français à besoin de vous Official LimeSurvey Partner | Web development | SkeletonQuest, RWD for LimeSurvey The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94088

 jvandernoll Offline Fresh Lemon Posts: 12 Karma: 0 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! The administrator has disabled public write access.

## randomly assign participants to groups 2 years 8 months ago #94089

 tpartner Online LimeSurvey Team Posts: 5276 Thank you received: 1101 Karma: 458 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. The administrator has disabled public write access. The following user(s) said Thank You: DenisChenu, jvandernoll

## randomly assign participants to groups 2 years 1 month ago #100605

 jvandernoll Offline Fresh Lemon Posts: 12 Karma: 0 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: but this does not work. Can you spot the mistake? Many thanks! The administrator has disabled public write access.

## randomly assign participants to groups 2 years 3 weeks ago #101344

 cecilia Offline Fresh Lemon Posts: 4 Karma: 0 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! The administrator has disabled public write access.

## randomly assign participants to groups 2 years 3 weeks ago #101488

 jvandernoll Offline Fresh Lemon Posts: 12 Karma: 0 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: The administrator has disabled public write access.
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