InstantForum 2017-1 FinalMillisecond Forumshttps://forums.millisecond.com/Millisecond ForumsWed, 29 Apr 2026 10:08:46 GMT20https://forums.millisecond.com/Topic20004.aspxHello,<br/>A web script that I posted doesn't seem to be performing the group assignments as expected.<br/>I have 108 different groups to assign to 324 potential participants.<br/>I selected the option that assigns groups sequentially, and when doing this I assumed that participant 109 would be assigned to group 1, and that the group assignments would continue as such. <br/>However, in my output I see that participants were assigned to groups that don't exist (i.e. group 109). <br/>Thus it is unclear which group these participants were assigned to. <br/>Is there something I'm missing, or has anyone else experienced something similar?<br/>Thanks in advance! :-)<br/>Mon, 31 Oct 2016 12:52:55 GMTmrsutherhttps://forums.millisecond.com/Topic20005.aspxA (in your case sequential) group number is generated when a participant visits the launch page -- this happens regardless of whether said participant ultimately decides to actually start the experiment or just leaves the page.<br/><br/>Condition assignment works on the basis of the provided groupnumber *modulo* the number of conditions. So, with 108 conditions and a groupnumber of 109, that participant would have received the 1st condition, because <br/><br/>109 modulo 108 = 1<br/><br/>just like <br/><br/>1 modulo 108 = 1<br/><br/>I.e., you can determine the condition that was administered based on the given groupnumber. More about that here: <a href="https://www.millisecond.com/forums/Topic13856.aspx">https://www.millisecond.com/forums/Topic13856.aspx</a><br/><br/>Hope this helps.<br/>Mon, 31 Oct 2016 12:52:55 GMTDave