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| تجربة عشوائية متصالبة محكومة× | التجارب العشوائية المنظمة (Blocked Randomized Controlled Trial)× | |
|---|---|---|
| المجال | التصميم التجريبي | التصميم التجريبي |
| العائلة | Process / pipeline | Process / pipeline |
| سنة النشأة≠ | 1960s (Grizzle 1965 for statistical foundations); widely used in clinical research since the 1970s | 1920s (Fisher's blocking principle); applied to RCTs from the 1940s onward |
| صاحب الطريقة≠ | Early formalized by statisticians including Bradford Hill and colleagues in clinical trials; theoretical framework developed by Grizzle (1965) and later Senn (2002) | R. A. Fisher (blocking principle); systematic RCT application by Bradford Hill and later Pocock, Friedman et al. |
| النوع≠ | Experimental within-subject design | Experimental design |
| المصدر التأسيسي≠ | Senn, S. (2002). Cross-over Trials in Clinical Research (2nd ed.). Wiley. ISBN: 978-0471496533 | 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 |
| الأسماء البديلة | crossover RCT, crossover trial, within-subject RCT, AB/BA crossover design | blocked RCT, block-randomized trial, stratified block randomization trial, permuted block randomization |
| ذات صلة | 5 | 5 |
| الملخص≠ | A crossover randomized controlled trial (crossover RCT) is an experimental design in which each participant receives all study interventions in a randomized sequence, separated by a washout period. Because every participant serves as their own control, within-subject variability is eliminated from the treatment comparison, yielding greater statistical power per participant than a parallel-group RCT of equal size. | 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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