For Three Intercorrelated Variables:
Given three overlapping correlation coefficients
r_{XY} r_{XZ} and
r_{YZ}
this page will calculate the firstorder partial correlations
r_{XY.Z} r_{XZ.Y} and
r_{YZ.X}
To proceed, enter the values of r_{XY} , r_{XZ} , and r_{YZ} into the designated cells below, then click the «Calculate» button. A negative value of r should be preceded by a minus sign: e.g., .76. Do not enter a plus sign; all entered values are assumed to be positive unless preceded by "". Values of r^{2} will calculated and entered automatically.
If you enter the value of N (providing N>6), the program will also calculate the values of t for the partial correlations (df=N—3) along with the associated twotailed probability values.
1st Order Partial Correlations

 r
 r^{2}
 t
 P

XY.Z
    
XZ.Y
    
YZ.X
    
P values are nondirectional (twotailed)

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©Richard Lowry 2001
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