Correlation

A measure of the relationship between scores. Correlation scores vary between -1.0 and +1.0, with zero indicating no correlation. Scores that measure similar things, such as related items on a scale or scores on scales measuring the same concept, should be highly correlated. Scores that are measuring different things should show a low correlation. It is also possible to have negative correlation scores, indicating an opposing relationship. For example, depression should be negatively correlated with well-being.