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Loop and Merge: EVEN randomization

  • 20 February 2019
  • 6 replies
  • 256 views
Rah
Badge +2
Hi,

I'm using loop and merge over 500 text-blocks (500 paragraphs). Each subject should evaluate a subset with randomly selected 50 text-blocks. Is there any way to make sure that we have an even random allocation, such that each text-block is displayed to only 10 subjects (very much similar to even randomizing function in the survey flow but for loop and merge)?

So far I´ve found this solution . But given the number of my text-blocks it's inefficient, I was wondering if it is the only solution!

Best,
Rah
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Best answer by TomG 20 February 2019, 17:11

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6 replies

TomG
Rank
Userlevel 7
Badge +27
No, the only solution is to loop based on a question that uses Advanced Randomization as described in the post you linked to. I don't know why you say it is inefficient. It isn't any more effort than setting up a regular loop & merge.
Rah
Badge +2
Most probably I have not understood the solution! 😕
How can I make a question with 500 answer options by "setting up a regular loop & merge"? Would you please elaborate on that or give me a link to where I can learn more about it?
TomG
Rank
Userlevel 7
Badge +27
> @Rah said:
> Most probably I have not understood the solution! 😕
> How can I make a question with 500 answer options by "setting up a regular loop & merge"? Would you please elaborate on that or give me a link to where I can learn more about it?

Before your Loop & Merge block, create a multiple choice question with your 500 text blocks as choices. Apply Advanced Randomization to randomly display 50 of the 500 text blocks evenly presented. Hide the question with JavaScript. Set your Loop & Merge to be based on the DISPLAYED choices in hidden question you just created. Do NOT check randomize.
Rah
Badge +2
Great. I did it and it works. The only problem is that even though I used the following code to hide the question, the question is displayed very briefly, like a flash. I found a similar question but didn´t understand what to do with the "padding" in the HTML code.

Qualtrics.SurveyEngine.addOnload(function() {
jQuery("#"+this.questionId).hide();
jQuery("#Buttons").hide();
});

Qualtrics.SurveyEngine.addOnReady(function() {
jQuery('#NextButton').click();
});
TomG
Rank
Userlevel 7
Badge +27
Just add a lot of padding to the beginning of the hidden question's text:
```
<div style="padding-top:1500px"></div>
```
E

Hi TomG ,
I have the same issue, however, I have 1045 loops. The maximum number of answer possibilities is 1000, any ideas on how to solve this? Or is there another way to make even randomization?
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