Evenly assigning participants within a group to two study conditions | XM Community
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Evenly assigning participants within a group to two study conditions

  • October 15, 2022
  • 1 reply
  • 417 views
J

Hi, I'm new to Qualtrics, so I hope I can get some help on this for a future study.
Essentially - I have two study groups (groups A and B). These people will have completed a prior survey that will classify them as belonging to groups A or B.
In a follow-up survey, they will be randomly assigned to condition 1 or condition 2. I'm aware of how to ensure they are equally assigned between each group, but what would I need to do to make sure they are equally randomized within each group?
For example, I have 100 participants with a 50/50 split for groups A and B. I evenly randomly assign the 100 to condition 1 or condition 2. Now, I would want to make sure that the 50 from group A (same for group B) are also equally assigned to conditions 1 or 2, so we don't end up with, say, 45 from group A were assigned to condition 1 and only 5 for condition 2.
I hope this makes sense. Thanks.

    1 reply

    TomG
    Level 8 ●●●●●●●●
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    • TomG
    • Level 8 ●●●●●●●●
    • October 15, 2022

    You can do your survey flow like this:
    If group equal to A
    Randomizer 1 of 2 evenly distributed
    Set Embedded Data: condition = 1
    Set Embedded Data: condition = 2
    If group equal to B
    Randomizer 1 of 2 evenly distributed
    Set Embedded Data: condition = 1
    Set Embedded Data: condition = 2
    If condition equal to 1
    { condition 1 blocks and/or logic go there }
    If condition equal to 2
     { condition 1 blocks and/or logic go there }
    

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