Day: April 25, 2018

Because randomization is a signature characteristic of an experiment, participants in a crossover design must be randomly assigned to different orderings of treatments. For example, if a crossover design were used to compare the effects of auditory and tactile stimulation on infant development, some infants would be randomly assigned to receive auditory stimulation first, and others would be assigned to receive tactile stimulation first. When there are three or more conditions to which participants will be exposed, the procedure of counterbalancing can be used to rule out ordering effects. For example, if there were three conditions (A, B, C), participants would be randomly assigned to one of six counterbalanced orderings

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