قارن الطرق

	تصميم التجربة العشوائية ذات المجموعات الضابطة المتقاطعة	تجربة عاملية متقاطعة
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	Mid-20th century; systematic treatment from 1980s onward	1920s–1960s (synthesis of factorial and crossover traditions)
صاحب الطريقة	Established in clinical pharmacology and agricultural research; formalized by B. Jones & M. G. Kenward	R. A. Fisher (factorial principles, 1920s); crossover integration developed in biostatistics through mid-20th century
النوع	Experimental design	Experimental design
المصدر التأسيسي	Jones, B., & Kenward, M. G. (2003). Design and Analysis of Cross-Over Trials (2nd ed.). Chapman and Hall/CRC. ISBN: 978-1584883500	Jones, B., & Kenward, M. G. (2014). Design and Analysis of Cross-Over Trials (3rd ed.). Chapman and Hall/CRC. ISBN: 978-1439861424
الأسماء البديلة	crossover controlled trial, within-subject crossover with control, AB/BA crossover controlled design, repeated-measures crossover with control arm	within-subject factorial design, repeated-measures factorial experiment, factorial crossover trial, crossover factorial trial
ذات صلة	6	5
الملخص	A crossover control group experimental design is an experimental approach in which participants are randomly assigned to sequences of conditions that include both a treatment and a control (no-treatment or placebo) period, with each participant experiencing both the experimental and control conditions in succession. By using each participant as their own control across periods, this design sharply reduces between-subject variability and typically requires fewer participants than parallel group trials to achieve equivalent statistical power.	A crossover factorial experiment combines two powerful design principles: factorial structure, which studies multiple factors and their interactions simultaneously, and crossover structure, in which each participant receives more than one treatment combination across sequential periods. By serving as their own control, participants reduce between-subject variability, improving statistical power while also revealing how different factor levels interact within the same individual.