Webstudy: Allocation of subjects to conditions

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Webstudy: Allocation of subjects to conditions

Webstudy: Allocation of subjects to conditions

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mariela	mariela posted 9 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 14, Visits: 25	Hi, i am currently setting up an experiment that I would like to conduct online. In this experiment I have 3 conditions (between). In a lab study I would assign participants by their subject id to the different conditions. <expt I> / blocks = [1= ...] / subjects = (1 of 3) </expt> <expt II> / blocks = [1= ...] / subjects = (2 of 3) </expt> <expt III> / blocks = [1= ...] / subjects = (3 of 3) </expt> How can I allocate subjects to conditions in an online study where I am not able to type in the subject ID manually? I would rather not want to provide different links to the same study, as I am using an online platform an participants could then participate several times in the study ... Thanks for your help, mariela
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Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	The options are (1) Have the launch page generate subject numbers randomly or sequentially. Assignment of a given participant to a given condition will be random (in latter case determine by when a given participant visits the launch page). (2) Pass the subject number in to the launch page via a URL query parameter. You could also consider assigning not by subject number, but using group number instead, i.e. <expt> / subjects = (1 of 3) / groupassignment = groupnumber ... </expt> ... The above options (random generation of group number, passing it in via query parameter) apply as well.
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