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; Pearson's R
Measure of the degree to which two variables are associated, based on the degree of their linear relationship. Correlation measures range between -1.0 and +1.0, where each extreme represents a perfect linear relationship and 0 represents no relationship.
A correlation coefficient equal to 0 means there is no linear relationship between the variables.
Gliner, J.A. and G.A. Morgan. 2000.
Research Methods in Applied Settings
, Mahwah, NJ: Lawrence Erlbaum Associates.
University of Glasgow. Statistics Glossary. Available at