Was random assignment used to place participants into different study groups?
• For studies received by the WWC prior to December 31, 2006: If the study authors used the term “random assignment” but gave no other indication of how the assignment procedure was carried out, the label is assumed to have been properly applied unless there is reason to doubt this claim.2 • For studies received by the WWC beginning January 1, 2007: For the sample allocation to be considered “random assignment,” the study authors must report specifics about the randomization procedure, including: (a) details about how the assignment sequence was generated (e.g., use of a random number table or generator, coin flip, roll of a die), (b) information about the role of the person who generated the sequence, and (c) methods used to conceal the sequence until participants were assigned to conditions. • Occasionally, researchers will use the term “random assignment” when they really mean “random selection.” Alternatively, they may use the term “random selection” to mean “random assignment.” Co
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