How to randomly draw one of the rows in a biploar matrix and display the choice of the respondent? | XM Community
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How to randomly draw one of the rows in a biploar matrix and display the choice of the respondent?

  • June 22, 2020
  • 6 replies
  • 55 views
A

Dear community,
I have a 10-row bipolar matrix in which the respondent chooses between option A and B. In the survey flow I set up a randomisation element, which picks a random number between 1 and 10. This number reflects a randomly drawn row of the bipolar matrix. I pipe the random number to a descriptive text and would like display the respondent's choice (A or B) in that particular, random row (1-10).
Is there any smart way to implement this (with or without JS)?
Cheers

Best answer by TomG

https://www.qualtrics.com/community/discussion/comment/27231#Comment_27231rcArr is an array where rcArr[0] is the left label and rcArr[1] is the right label. randRecode is the answer selected where 1 is left and 2 is right (you could recode them to 0 and 1 to match the rcArr indices).
To show what they selected you need some html and JS.
html where you want to pipe the selected choice text:

JS:
jQuery("#choiceText").html(rcArr[parseInt("${e://Field/randRecode}")-1]);
If you want to pipe the random row number, you need to add another field to your embedded data blocks (e.g., randRow = 1).

6 replies

TomG
Level 8 ●●●●●●●●
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  • TomG
  • Level 8 ●●●●●●●●
  • June 22, 2020

Instead of generating a random number, use a randomizer to pick one of ten embedded data blocks with the recode and choice text. Here is an example with 2 embedded data blocks:
image.pngThen pipe randRecode and randChoice into JavaScript, parse randChoice with split() and then use randRecode to choose the left or right string.

A
  • AnnikaFran
  • Author
  • June 24, 2020

Ok, great. Thanks for the tip. Can you also provide me with the JS code? I'm a novice to JS and I've no clue how to use the split function.

TomG
Level 8 ●●●●●●●●
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  • TomG
  • Level 8 ●●●●●●●●
  • June 24, 2020

https://www.qualtrics.com/community/discussion/comment/27105#Comment_27105var rcArr = "${e://Field/randChoice}".split("||QBipolarDelim||");

A
  • AnnikaFran
  • Author
  • June 24, 2020

As a follow-up: I would like to then use the decision of the participant (A or B) in a randomly drawn decision situation (1-10) and calculate his prize in that lottery.
image.pngTo do so, I need another random draw. Either drawing I or II with different probabilities (depending on the randomly drawn decision situation 1-10) or drawing 1 - 10 in which e.g. (decision situation 2) 1 and 2 represent I and 3-10 represent II.

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TomG
A
  • AnnikaFran
  • Author
  • June 26, 2020

I got the first bit, the random draw of a decision situation:
image.pngWe randomly drew decision number ${e://Field/randRecode}, in which you selected lottery ${e://Field/randChoice}
With the JS code looking as follows:
var rcArr = "${e://Field/randChoice}".split("||QBipolarDelim||"); 
Yet, as you see in the screenshot, the random decision number is not followed by the correct description text (needs to be linked) and I don't know how to display the actual decision of the participant (A or B/left or right).
Any ideas how to link randRecode and randChoice and how to display randChoice and not the descriptive text?

TomG
Level 8 ●●●●●●●●
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  • TomG
  • Level 8 ●●●●●●●●
  • Answer
  • June 26, 2020

https://www.qualtrics.com/community/discussion/comment/27231#Comment_27231rcArr is an array where rcArr[0] is the left label and rcArr[1] is the right label. randRecode is the answer selected where 1 is left and 2 is right (you could recode them to 0 and 1 to match the rcArr indices).
To show what they selected you need some html and JS.
html where you want to pipe the selected choice text:

JS:
jQuery("#choiceText").html(rcArr[parseInt("${e://Field/randRecode}")-1]);
If you want to pipe the random row number, you need to add another field to your embedded data blocks (e.g., randRow = 1).

A
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