![]() Otherwise, moderation of slopes and of correlations must diverge. Given a linear relationship between two continuous random variables X and Y that may be moderated by a third, Z, the extent to which the correlation ρ is (un)moderated by Z is equivalent to the extent to which the regression coefficients β y and β x are (un)moderated by Z iff the variance ratio σ y 2 ∕ σ x 2 is constant over the range or states of Z. Psychology, The Australian National University, Canberra, ACT, Australia.
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