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— A type of randomized study in which the effects of two or more treatments are compared by giving them separately, together, or not at all
factorial design, factorial trial
Factorial studies can be an efficient way of assessing the effects of three or more treatments concurrently.
For example, such a study might compare Drug A alone, Drug B alone, Drugs A and B given together, and a group receiving neither drug - .four groups compared n what in this instance would be a 2-by-2 factorial design
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