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	Coefficiente di correlazione per ranghi di Spearman	Correlazione per ranghi di Kendall Tau
Campo	Statistica	Statistica
Famiglia	Hypothesis test	Hypothesis test
Anno di origine	1904	1938
Ideatore	Charles Spearman	Maurice G. Kendall
Tipo	Nonparametric rank-based correlation	Rank-based association measure
Fonte seminale	Spearman, C. (1904). The proof and measurement of association between two things. The American Journal of Psychology, 15, 72–101.	Kendall, M. G. (1938). A new measure of rank correlation. Biometrika, 30(1–2), 81–93.
Alias	Spearman's rho, Spearman rank-order correlation, Spearman Sıra Korelasyonu	Kendall's tau, Kendall tau-b, tau correlation, Kendall Tau Korelasyonu
Correlati	4	4
Sintesi	The Spearman rank correlation coefficient (ρ) is a nonparametric measure of the monotonic association between two variables. Introduced by Charles Spearman in 1904, it converts raw observations to ranks and measures how consistently one variable increases as the other increases, without assuming a normal distribution or a linear relationship.	Kendall Tau is a nonparametric rank correlation coefficient introduced by Maurice G. Kendall in 1938 to measure the strength and direction of a monotone association between two ordinal or continuous variables. It is particularly suited to small samples and datasets containing many tied ranks, where the Spearman coefficient can be less stable.