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Coefficients of Association Analogous to Pearson's r for nonparametric Statistics

University of Southern California

Alan C. Acock

University of Oklahoma

The r_z and r_p coefficients of association are discussed. Both coefficients, like Pearson's r, are based on a z/z_max framework. They yield coefficients directly comparable for all levels of measurement being based on an obtained/maximum departure from independence in z units interpretation. The r _z coefficient can be applied to any nonparametric test statistic in which a normal approximation equation is appropriate. The r_p coefficient is applicable to any nonparametric test statistic in which exact probabilities are known.

Educational and Psychological Measurement, Vol. 40, No. 3, 679-685 (1980)
DOI: 10.1177/001316448004000311


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