Controlling number of participants per cell


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shareli@univ.haifa.ac.il
shareli@univ.haifa.ac.il
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Hi
Say I have 10 conditions in my experiment which I run on the web. I wish to have 30 participants allocated to each condition. Conditions appear randomly. Is there a way to ensure that I get only 30 participants per condition and not more so that a condition stops being selected once it is full. Also, since participants may start the study but not complete it, I want to stop selecting the condition only when completed studies reached the number of participants set. Is there a way to do it? 
Thanks much
Shlomo 

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