Seeded permuted-block allocation demo
Generate a reproducible balanced two-group sequence for teaching allocation mechanics.
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Total must be 2–200 and a multiple of an even block size from 2 to 20. Seed is an integer from zero to 1,000,000,000. Use synthetic exercises only.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- Teaching sequence
- B, B, A, A, B, B, A, A, B, B, A, A
- A allocations
- 6
- B allocations
- 6
- Use restriction
- Predictable educational sequence; not operational trial randomization.
How to interpret the output
Each fixed-size block contains equal A and B assignments, shuffled by Fisher–Yates with a seeded pseudorandom generator. Fixed block sizes can reveal assignments and this generator is predictable. It is not suitable for operational trial allocation or concealment; use an independently governed validated randomization service.
Method referenceSource checked 2026-11-06. Read the reproducible calculator validation report.