So sánh phương pháp

	Kiểm định A/B bị chặn	Thử nghiệm kiểm soát ngẫu nhiên theo khối (Blocked Randomized Controlled Trial)
Lĩnh vực	Thiết kế thí nghiệm	Thiết kế thí nghiệm
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1926 (blocking principle); 2000s–2010s (online A/B testing application)	1920s (Fisher's blocking principle); applied to RCTs from the 1940s onward
Người khởi xướng	R. A. Fisher (blocking principle); adapted to online A/B testing by industry practitioners	R. A. Fisher (blocking principle); systematic RCT application by Bradford Hill and later Pocock, Friedman et al.
Loại	Randomized controlled experiment with variance reduction	Experimental design
Công trình gốc	Fisher, R. A. (1926). The arrangement of field experiments. Journal of the Ministry of Agriculture of Great Britain, 33, 503–513.	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
Tên gọi khác	block-randomized A/B test, stratified A/B test, blocked split test, block-design A/B experiment	blocked RCT, block-randomized trial, stratified block randomization trial, permuted block randomization
Liên quan	4	5
Tóm tắt	A blocked A/B test is an experimental design that partitions units (users, subjects, or clusters) into homogeneous blocks before randomly assigning them to treatment A or treatment B within each block. Blocking reduces within-experiment noise by ensuring that known sources of variation — such as device type, geography, or user tenure — are balanced across conditions, yielding more precise estimates of the treatment effect than a simple unblocked A/B test.	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.