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factorial study

— 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

Synonyms:

factorial design, factorial trial

Full explanation:

Factorial studies can be an efficient way of assessing the effects of three or more treatments concurrently.

Example:

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

See also:

randomized study

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