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?:definition
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An administrative activity defined at a global library level that is the assignment of an experimental unit to a portion of the study, such as an arm or a portion of an arm (when secondary allocations may occur). EXAMPLE(S): randomization, direct assignment based on eligibility criteria, etc. \'Escalating dose cohort studies\' enroll subjects in successive arms, i.e., one arm is completely filled before any subjects are enrolled in the next arm. In such a study, allocation depends on which arms have been fully enrolled and which are currently open for enrollment. Note that this example assumes that the experimental unit is the subject (rather than a part of a subject or a group of subjects). OTHER NAME(S): NOTE(S):
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