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Group: Administrators
Posts: 13K,
Visits: 104K
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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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