There are many different types of experimental designs for different study scenarios. Crossover design is a special design in which each experimental unit receives a sequence of experimental treatments. In practice, it is not necessary that all permutations of all treatments be used. Researchers also call it switchover design, compared with a parallel group design, in which some experimental units only get a specific treatment and other experimental units get another treatment. In fact, the crossover design is a specific type of repeated measures experimental design. In the traditional repeated measures experiment, the experimental units, which are applied to one treatment (or one treatment combination) throughout the whole experiment, are measured more than one time, resulting in correlations between the measurements. The difference between crossover ...

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