types:

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rank-difference correlation, rank-difference correlation coefficient, rank-order correlation, rank-order correlation coefficient

the most commonly used method of computing a correlation coefficient between the ranks of scores on two variables

Kendall test

any of several nonparametric measures of correlation (used when the assumptions of standard correlational analysis are not met)

fourfold point correlation, phi coefficient, phi correlation

an index of the relation between any two sets of scores that can both be represented on ordered binary dimensions (e.g., male-female)

Kendall partial rank correlation

a nonparametric measure of partial correlation

coefficient of concordance

a coefficient of agreement (concordance) between different sets of rank orderings of the same set of things

Kendall rank correlation, Kendall's tau, tau coefficient of correlation

a nonparametric measure of the agreement between two rankings

type of:

statistic

a datum that can be represented numerically