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Cluster Randomized Controlled Trial — Group-Level Randomization
A cluster randomized controlled trial (cluster RCT) is an experimental design in which intact social or organisational groups — such as schools, clinics, villages, or workplaces — are randomly assigned to treatment conditions rather than individual participants. Outcomes are still measured at the individual level, but the unit of randomization is the cluster. This design is essential when an intervention is delivered to whole groups, when there is a risk of contamination between participants in the same setting, or when individual randomization is logistically or ethically impractical.
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Sources
- Donner, A., & Klar, N. (2000). Design and Analysis of Cluster Randomization Trials in Health Research. Arnold. ISBN: 978-0340652978
- Hayes, R. J., & Moulton, L. H. (2017). Cluster Randomised Trials (2nd ed.). CRC Press / Chapman & Hall. ISBN: 978-1498728225
Related methods
Referenced by
Blocked Randomized Controlled TrialCluster Randomized A/B TestCluster Randomized Adaptive ExperimentCluster Randomized Control Group Experimental DesignCluster Randomized Factorial ExperimentCluster Randomized Field ExperimentCluster Randomized Fractional Factorial ExperimentCluster Randomized Full Factorial ExperimentCluster Randomized Laboratory ExperimentCluster Randomized Multi-Arm ExperimentCluster Randomized Multiple Baseline DesignCluster Randomized Solomon Four-Group DesignField ExperimentMulti-arm experimentPilot Randomized Controlled TrialPragmatic control group experimental designPragmatic Randomized Controlled TrialPragmatic Solomon Four-Group DesignSingle-blind Randomized Controlled Trial