ABSTRACT
Correlations are relationships between two or more variables or sets of variables (Cohen and Cohen, 1983). In statistics there is a distinction between an association and a correlation, though these terms are often used interchangably. Two variables are associated if one of them provides information about the likely value of the other. If the association between two variables is linear, there is a correlation. Therefore, strictly speaking, “non-linear correlation” is an incorrect terminology, a better term is “non-linear association”.
