Tag

Cluster RCT

3 cards

HealthRCT
Absence of Within-School Cross-Classroom Spillovers
Spillover students exhibited non-significant knowledge improvements of 0.015 SD at 1 week and 0.011 SD at 6 months, and non-significant attitude changes of 0.026 SD at 1 week and 0.022 SD at 6 months compared to pure control schools.
Methods & evidenceRCT
Two-Stage School and Classroom Cluster Randomization
Disentangled direct treatment impacts from intra-school spillovers, proving zero statistical spillover to untreated classrooms (0.011 SD knowledge gain, 0.022 SD attitude gain).
Methods & evidenceRCT
Within-School Randomization Spillover
Individual student randomization within schools amplified social stigmatization and generated unavoidable treatment spillovers across treatment and control arms, contributing to zero-session attendance rates of 70.0% in CBT and 97.0% in math tutoring.