While Spearman's rho (ri) and Kendall's tau (t) are equally powerful rank-order correlation coefficients under conditions of normality, they have quite different metrics. When applied to the same data set, t typically is smaller in absolute value, often no more than two-thirds the size of r,. Although these facts are duly stated in a number of works on nonparametric statistics, they are omitted in many other, less detailed presentations. Given increasing concern with the degree to which a statistical effect existsrather than just whether an effect is present at all—this difference in correlational metric appears to need emphasis.
CITATION STYLE
Strahan, R. F. (1982). Assessing Magnitude of Effect from Rank-Order Correlation Coefficients. Educational and Psychological Measurement, 42(3), 763–765. https://doi.org/10.1177/001316448204200306
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