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Sample record

RCTOpen AccessPreregistered

Spacing effect in high-school biology: a cluster-randomized trial across 42 classrooms

Chen, W., Boateng, F., & Ríos, D. — Learning & Instruction, 2025

Sample: n=1,284
Effect: d = 0.41
Replication: 2 of 2

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Harvard Graduate School of EducationStanford Graduate School of EducationUCL Institute of EducationOECDAERAVanderbilt Peabody CollegeUniversity of Michigan School of EducationOISE at the University of TorontoNCTQU.S. Institute of Education Sciences

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PubEd.org is an independent nonprofit organization and open education-research library. It is not affiliated with, endorsed by, or sponsored by the U.S. National Library of Medicine, PubMed®, MEDLINE, or any government agency. References to universities, government agencies, professional organizations, and research institutions identify publicly available research, frameworks, standards, or publications that informed aspects of this platform. Such references do not imply affiliation, sponsorship, endorsement, or review by those institutions. Names and trademarks remain the property of their respective owners.

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Last updated: July 3, 2026