Pearson's r isn't the only game in town...
|Name||Symbol||Characteristic of Variables|
|Pearson's Product Moment||r||Both are continuous (interval or ratio)|
|Rank Order||r||Both are rank (ordinal)|
|Point-Biserial||rpbis||One is continuous (interval or ratio) and one is nominal with two values|
|Biserial||rbis||Both are continuous, but one has been artificially broken down into nominal values.|
|Phi||f||Both are nominal and each has two values.|
|Contingency||C||Both are nominal and each has more than two values.|
|Tetrachoric||rt||Both are continuous, but each has been artificially broken down into two nominal values.|
|Eta||h||Both are continuous and are used to detect curvilinear relationships.|
Del Siegle, Ph.D.
Neag School of Education - University of Connecticut