Compara mètodes

	Test de Friedman	Test de permutació (aleatorització)
Camp	Estadística	Estadística
Família	Hypothesis test	Regression model
Any d'origen	1937	2005
Autor original	Milton Friedman	Good (2005); Edgington & Onghena (2007); resampling tradition
Tipus	Nonparametric repeated-measures comparison (by ranks)	Nonparametric resampling test
Font seminal	Friedman, M. (1937). The use of ranks to avoid the assumption of normality implicit in the analysis of variance. Journal of the American Statistical Association, 32(200), 675–701.	Good, P. (2005). Permutation, Parametric and Bootstrap Tests of Hypotheses (3rd ed.). Springer. ISBN: 978-0387202792
Àlies	Friedman two-way analysis of variance by ranks, Friedman rank test, Friedman Testi	randomization test, exact permutation test, re-randomization test, Permütasyon Testi
Relacionats	2	5
Resum	The Friedman test is a nonparametric hypothesis test that compares three or more related conditions measured on the same blocks or subjects, serving as the rank-based alternative to repeated-measures ANOVA. It was introduced by Milton Friedman in 1937 and works on ordinal or continuous data without assuming normality.	The permutation test is a nonparametric resampling procedure that builds the sampling distribution of a test statistic directly from the data by repeatedly shuffling the group labels. Developed in the resampling tradition and treated systematically by Good (2005) and Edgington & Onghena (2007), it requires no parametric distributional assumption and yields an exact p-value.