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Group randomized studies are studies in which whole groups of subjects are randomized to a particular treatment. For example, instead of randomizing every student in a school to a particular treatment, it might only be possible to randomize by teacher, so that all students with the same teacher receive the same treatment. These types of designs require special statistical methods in their analysis.

One example of this type of study is:

• Fellows I., (2006). Partnerships Involving the Scientific Community in Elementary Schools (PISCES), a Randomized Controlled Crossover Study Implementing Inquiry Based Science in Elementary Classrooms: 2003-04, 2004-05 Combined Report, Technical Report, SDSU