A semi-partial r (also referred to as a semi-partial correlation) provides some information about the correlation between two variables, removing the influence of a third variable, but only from one of the two variables. A semi-partial correlation is useful for communication researchers when they desire to remove the variability from one element of the analysis but not the other element. To provide further understanding of this correlation, this entry provides definitions and implications of correlation, partial correlation, and semi-partial correlation.


A correlation between two variables (X and Y) is a measure of the degree of correspondence between the two variables, and is represented as rXY. Essentially, as the value of one variable changes, researchers want to know what happens to the value of the other variable. ...

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