قارن الطرق

	تجربة معملية عشوائية عنقودية	تجربة معملية محظورة - تصميم القطاعات العشوائية في البيئات المعملية
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1990s (formalized; cluster randomization principles developed in 1970s-1980s)	1926–1935
صاحب الطريقة	David M. Murray (group-randomized trial methodology); built on classical cluster sampling in experimental design	Ronald A. Fisher
النوع	Controlled laboratory experiment with cluster-level randomization	Controlled experimental design with blocking
المصدر التأسيسي	Murray, D. M. (1998). Design and Analysis of Group-Randomized Trials. Oxford University Press. ISBN: 978-0195120363	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.
الأسماء البديلة	cluster-randomized lab experiment, group-randomized laboratory study, cluster RCT laboratory variant, clustered lab trial	blocked lab experiment, laboratory randomized block design, RBD laboratory study, blocked within-lab experiment
ذات صلة	6	5
الملخص	A cluster randomized laboratory experiment assigns intact groups — such as lab sections, cohorts, or naturally formed teams — rather than individual participants, to experimental conditions. All participants within a cluster receive the same treatment. The design is used when individual randomization would cause contamination between conditions, while retaining the controlled environment of a laboratory setting.	A blocked laboratory experiment is a controlled laboratory study in which experimental units are grouped into homogeneous blocks before treatment assignment, and treatments are then randomly assigned within each block. Blocking removes the influence of a known nuisance variable — such as participant batch, equipment run, or testing day — from the error term, increasing the precision of treatment comparisons without expanding sample size.