Although the participants in some quasi-experimental designs can be individuals or groups of individuals,in regression-discontinuity studies,they can only be individuals.

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In regression-discontinuity designs, the participants can be either individuals or groups, such as schools or communities. The key feature of this design is the assignment of participants to treatment or control groups based on a cutoff score on a pre-determined criterion, not the nature (individual or group) of the participants.

Although the Participants in Some Quasi-Experimental Designs Can Be Individuals