Correlation, Pearson r
Correlation, Pearson r : A statistical technique used to assess the magnitude and the direction of the relationship between two variables. Values of the Pearson r can range between -1 and +1. The continuum of -1 to 0 indicates the degree of strength of an inverse relationship. The continuum of 0 to +1 indicates the degree of strength of a positive relationship. A Pearson r of 0 indicates no linear relationship. For example, bicycle helmet use and bicycle accident head injury are negatively correlated; asbestos exposure and cumulative incidence of mesothelioma are positively correlated
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