What is another word for rank-order correlation coefficient?
Pronunciation: [ɹˈaŋkˈɔːdə kˌɒɹɪlˈe͡ɪʃən kˌə͡ʊɪfˈɪʃənt] (IPA) 
Rank-order correlation coefficient, or correlation coefficient for short, is a measure of the strength and direction of the relationship between two variables that are measured on ordinal scales. Some common synonyms for rank-order correlation coefficient include Kendall's tau, Spearman's rho, and Goodman and Kruskal's gamma. Kendall's tau and Spearman's rho are commonly used measures of correlation for two or more variables, while Goodman and Kruskal's gamma is typically used for two variables only. Other synonyms that refer to correlation coefficients include Pearson's correlation coefficient, which measures the linear relationship between two variables that are measured on interval or ratio scales, and partial correlation coefficient, which measures the strength of the relationship between two variables after controlling for the effects of one or more other variables.
