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Block randomization is a modified random assignment strategy used to keep sample sizes similar across groups. A sequence is created where every condition appears once in a randomized order within a designated block before any condition is repeated. As each new participant enters the study, they are assigned to the next available condition in this pre-generated sequence.

Block Randomization

An example of block randomization involves assigning nine participants to three conditions: A, B, and C. A pre-generated sequence might have a first block of A, C, B, a second block of B, C, A, and a third block of C, B, A. The first participant is assigned to condition A, the second to condition C, the third to condition B, and so forth, guaranteeing that after every three participants, the conditions have perfectly equal sample sizes.

Block Randomization Sequence Example

____ randomization is a modified random assignment strategy used to keep sample sizes similar across groups by creating a sequence where every condition appears once before any condition is repeated.

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