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random allocation

— The process of assigning participants in a study to treatment comparison groups using a chance process, like drawing lots, to protect against bias.

Synonyms:

randomization, random selection

Full explanation:

Random allocation of participants to treatment comparison groups ensures that each participant has a known (usually an equal) chance of being assigned to any given group.

This results in treatment comparison groups that are similar in terms of prognostic variables, whether or not these have been recognised.

Cartoon:

See also:

randomized study

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