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Study designs Placebo-controlled75 Placebo-controlled75

Subjects are randomly assigned to either treatment or control arms, and they remain in that arm for the duration of the study

Double-blinded: both investigators and subjects are masked to the treatment

Advantages include reducing bias through randomization, experiments can be run simultaneously in a number of groups, and groups can be in separate locations


75. Pennsylvania State University. STAT 509: Design and Analysis of Clinical Trials. 3.3: Experimental Design Terminology. Available at