Krahasoni metodat

	Dizajn kuazij eksperimental i bllokuar natyral	Protokoll i Kontrolluar i Randomizuar me Bllokim
Fusha	Dizajni eksperimental	Dizajni eksperimental
Familja	Process / pipeline	Process / pipeline
Viti i origjinës	Blocking: 1935; natural experiments as formal causal framework: 1990s–2000s	1920s (Fisher's blocking principle); applied to RCTs from the 1940s onward
Krijuesi	Combines Fisher's blocking principle (1935) with natural experiment methodology formalized by Angrist and Pischke (2009)	R. A. Fisher (blocking principle); systematic RCT application by Bradford Hill and later Pocock, Friedman et al.
Lloji	Quasi-experimental causal design	Experimental design
Burimi themelues	Angrist, J. D., & Pischke, J.-S. (2009). Mostly Harmless Econometrics: An Empiricist's Companion. Princeton University Press. ISBN: 978-0691120355	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
Emërtime të tjera	stratified natural experiment, block-stratified quasi-experiment, natural experiment with blocking	blocked RCT, block-randomized trial, stratified block randomization trial, permuted block randomization
Të lidhura	3	5
Përmbledhja	A blocked natural experiment is a quasi-experimental design that exploits naturally occurring, researcher-uncontrolled variation in treatment assignment while pre-stratifying (blocking) units on key observed covariates. Blocking absorbs between-stratum variance, improves statistical precision, and strengthens the plausibility of the as-if-random assumption within each block. The design draws on Fisher's blocking principle and the natural experiment tradition in economics and epidemiology.	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.