Partial correlations have an order associated with them. The order indicates how many variables are being adjusted or controlled. The simple correlation coefficient, r, has a , as it does not control for any additional variables when measuring the association between two variables. The coefficient r_sy.zis a partial correlation coefficient, as it controls for the effect of one additional variable, Z. A) first- order; second- order B) zero- order; second- order C) first- order; third- order D) zero- order; first- order

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The simple correlation coefficient, r, is a zero-order correlation because it does not control for any additional variables. The coefficient r_sy.z is a first-order partial correlation because it controls for the effect of one additional variable, Z.

Partial Correlations Have an Order Associated with Them