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Combining blocks for advanced randomization

  • January 7, 2021
  • 4 replies
  • 250 views
M

Hi there,
I have a specific study that I'm looking to create using randomization, but I'm not sure how to go about doing it. Here are the details:
I have 20 videos that are split into 2 groups of 10. I would like participants to watch 4 videos from group 1 and 4 videos from group 2 randomly. Participants would see 8 videos in total. I would like the order of the videos they watch to be randomly chosen from each group and mixed together. So, they may see a video from group 1 and then group 2, for example until they have watched 4 from each group. After each video, they will answer a few questions.
The trouble I'm having is that I don't want the groups blocked together. Currently, participants will see 4 random videos from group 1 and then 4 random videos from group 2. Ideally, I would have the videos they watch be mixed up.
Thank you for any help!

      4 replies

      A
      Level 7 ●●●●●●●
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      • ahmedA
      • Level 7 ●●●●●●●
      • January 7, 2021

      You can use the code here.
      It does the following, from a page of, 10 videos, 5 normal and 5 animated, it selects 4 videos, 2 normal and 2 animated, and hides the rest. These are displayed in a randomized manner. Refresh the page repeatedly to confirm. The demo for it is here.

      M
      • MackenzieF
      • Author
      • January 8, 2021

      Hi there,
      Thank you! I was able to use the code to randomize my videos. The only issue is that participants need to answer a few questions after seeing each video. The way I see it now is that all of the videos are randomized and posted on 1 single page. Is there any way to have them directed to completing the questions before watching the next video?
      Thanks!

      A
      Level 7 ●●●●●●●
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      • ahmedA
      • Level 7 ●●●●●●●
      • January 8, 2021

      For that you'll have to use branch/display logic. Store 

      hide_a
      and 
      hide_b
      as embedded data variables. Make a block of video+questions. So you'll have Block A1....A10 and B1....B10. Put them in a randomizer, where all 20 elements are shown. Then add a branch/display logic to each block, where it gets shown only if the relevant number is not in 
      hide_a
      or 
      hide_b
      . Example for video 2 of block B, it will be 
      hide_b does not contain 2
      .

        J
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        • janessen
        • May 14, 2021

        https://www.qualtrics.com/community/discussion/comment/33213#Comment_33213Hi, were you ever able to solve this? :) I am currently having a similar problem with the randomization of two blocks.

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