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Randomization

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smb	smb posted 9 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 3, Visits: 13	I am combining scripts using the batch command. Two separate scripts randomize participants using their subject ID, but these separate portions of the experiment need to be randomized in the same way (i.e., in part one, the participant needs to see a specific colored background and in part two they need to see a background color that does not match what they previously saw). The way I have the scripts set up does this, but I am worried about what happens if people quit the study between these two components. For example, if someone completes the first part with the initial randomization but not the second part with the other randomization, will that throw off the match between the randomization for the first and second components for later participants? Thanks for any help. I can also clarify if my question in unclear in any way.
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Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	> The way I have the scripts set up does this, but I am worried about what happens if people quit the study between these two > components. For example, if someone completes the first part with the initial randomization but not the second part with the > other randomization, will that throw off the match between the randomization for the first and second components for later > participants? No, it will not have any effect on other participants / their randomization at all. The subject number is assigned when someone visits the launch page. The number is the same for all scripts run in via the <batch> (otherwise you wouldn't be able to match the data). Whether the given participant completes all scripts or decides to bail out prematurely has no effect whatsoever on other participants. You can try this for yourself. Start, quit midway, refresh the launch page and repeat.
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