partial correlation

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In statistics, a correlation between two variables with the effect of a third variable controlled or partialled out. For example, if x, y, and z represent the heights, weights, and ages of children, respectively, then a significant positive correlation between x and y may be due in part to the correlation of each of these variables with z. A partial correlation coefficient between x and y with z partialled out, written rxy.z, shows the degree of linear relationship between height and weight irrespective of age.

Subjects: Psychology.

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