Restricted randomization refers to a method used in experimental design, particularly in randomized controlled trials (RCTs), where certain constraints or rules are applied to the random assignment of participants to different treatment groups. This approach helps ensure that specific characteristics are balanced across groups while still maintaining an element of randomness. Some common forms of restricted randomization include: 1. **Stratified Randomization**: Participants are divided into subgroups (strata) based on certain characteristics (e.g.
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