## Some Other Correlation Coefficients

A number of other correlation coefficients are also encountered. Some of these are simply the Pearson coefficient applied to specific classes of data. Examples are the Spearman rank-order correlation coefficient, which is just the Pearson coefficient applied to ranked data, and the point-biserial correlation coefficient, which can be thought of as the regular Pearson coefficient applied to data in which Y is continuous and X is dichotomous (i.e., X takes on only two possible values). The so-called phi coefficient is just the Pearson coefficient applied to data in which both X and Y are dichotomous.

Several other measures make assumptions of underlying normality to estimate what the correlation would

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