Counterbalanced designs allow for testing of multiple interventions concurrently
The counterbalanced design is often employed when several interventions are being tested concurrently. After random selection from the population, the study subjects are divided up into independent groups. Each group receives each intervention, but in a different order from the other respective groups. An observation of the outcome is taken after each series of interventions in the counterbalanced design. The counterbalanced design is a powerful design because each participant serves as their own control and multiple interventions can be tested at the same time.
A = Group A, B = Group B, C = Group C, D = Group D, T = Treatment, M = Measurement of the outcome
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