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| Blocked AB Design× | Blockrandomisierte kontrollierte Studie× | |
|---|---|---|
| Fachgebiet | Versuchsplanung | Versuchsplanung |
| Familie | Process / pipeline | Process / pipeline |
| Entstehungsjahr≠ | 1970s–1980s (systematic development of blocked randomization in single-case research) | 1920s (Fisher's blocking principle); applied to RCTs from the 1940s onward |
| Urheber≠ | Based on Fisher's randomized block principle (1926) applied to single-case AB designs | R. A. Fisher (blocking principle); systematic RCT application by Bradford Hill and later Pocock, Friedman et al. |
| Typ≠ | Single-subject experimental design with blocking | Experimental design |
| Wegweisende Quelle≠ | Edgington, E., & Onghena, P. (2007). Randomization Tests (4th ed.). Chapman and Hall/CRC. ISBN: 978-1584885894 | Friedman, L. M., Furberg, C. D., DeMets, D. L., Reboussin, D. M., & Granger, C. B. (2010). Fundamentals of Clinical Trials (4th ed.). Springer. ISBN: 978-1441915856 |
| Aliasnamen | blocked AB single-case design, randomized block AB design, AB design with blocking, blocked baseline-treatment design | blocked RCT, block-randomized trial, stratified block randomization trial, permuted block randomization |
| Verwandt≠ | 6 | 5 |
| Zusammenfassung≠ | The Blocked AB Design applies the logic of randomized block experimental design to the classic single-subject AB framework. Observation sessions are organized into blocks — matched sets of time points or contextual units — and the assignment of baseline (A) and treatment (B) phases is randomized within each block. This controls for nuisance time-based variability while preserving the interpretive simplicity of the fundamental two-phase single-case structure. | A blocked randomized controlled trial (blocked RCT) uses permuted-block randomization to ensure that treatment groups remain balanced in size — and optionally in key characteristics — throughout recruitment. Within each block of fixed or randomly varied size, all treatment allocations are present in equal numbers, so imbalance cannot accumulate even if the trial is stopped early. This makes blocked RCTs the standard randomization approach in clinical and behavioral intervention research. |
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