randomized design

any of various experimental designs in which individual participants are assigned to different conditions (groups) using a purely chance process, such as rolling a die. A crucial assumption underlying randomized designs is that any systematic differences between treatment groups will be due to the experimental conditions themselves and not to any other unmeasured factors. Also called randomized group design. Compare nonrandomized design.

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Psychology term of the day

October 9th 2024

Edwards syndrome

see trisomy 18. [John Hilton Edwards (1928–2007), British geneticist]