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	Correlazione di rango Tau di Kendall	Analisi della dimensione dell'effetto
Campo	Statistica	Statistica
Famiglia	Hypothesis test	Hypothesis test
Anno di origine	1938	1969 (first edition); 1988 (definitive second edition)
Ideatore	Maurice G. Kendall	Jacob Cohen
Tipo	Nonparametric rank correlation	Standardized magnitude estimation
Fonte seminale	Kendall, M. G. (1938). A new measure of rank correlation. Biometrika, 30(1/2), 81–93.	Cohen, J. (1988). Statistical Power Analysis for the Behavioral Sciences (2nd ed.). Lawrence Erlbaum Associates. ISBN: 978-0805802832
Alias	Kendall tau, Kendall rank correlation, tau-b, tau-c	effect magnitude estimation, standardized effect measure, practical significance analysis, ES analysis
Correlati	4	4
Sintesi	Kendall's tau is a nonparametric measure of the ordinal association between two variables. It quantifies how consistently the relative ordering of one variable matches the ordering of another across all observation pairs, making it robust to outliers and suitable for ordinal or non-normally distributed data.	Effect size analysis quantifies the practical magnitude of a statistical result independently of sample size. Rather than asking only whether a difference or relationship is statistically significant, it asks how large it is, using standardized indices such as Cohen's d, eta-squared, omega-squared, or Pearson's r that allow direct comparison across studies and populations.