InstantForum 2017-1 FinalMillisecond Forumshttps://forums.millisecond.com/Millisecond ForumsSun, 13 Sep 2026 02:03:50 GMT20https://forums.millisecond.com/Topic19609.aspxHi, <br/><br/>Is there any way to get random selection without replacement of stimuli between consecutive participants? Say I have four different pieces of sound stimuli as a between subjects variable and need automatic, equal, and random distribution of participants to the four conditions. How do I do that? <br/><br/>I look forward to any suggestions you may have! <br/><br/>Thanks, <br/>Freddie<br/>Tue, 30 Aug 2016 07:15:48 GMTdukanskehttps://forums.millisecond.com/Topic19612.aspxYou implement that like any other between-subjects condition, i.e., set up for &lt;expt&gt;s (one per condition), or use the &lt;variables&gt; element (not generally recommended), or use conditional &lt;include&gt; elements (one per condition). If you're in the lab, you obviously have direct control over how you assign participants to conditions. If on the web, you have several options:<br/>- generate a random id for assignment (without replacement)<br/>- use sequential id generation, or<br/>- pass the id in via a query parameter if you want direct control.<br/>Tue, 30 Aug 2016 07:15:48 GMTDave