For Four Intercorrelated Variables:
This page will calculate the first and secondorder partial correlations for four intercorrelated variables, W, X, Y, and Z.
To proceed, enter the values of r_{WX} , r_{WY} , and so forth, 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 a value of N (providing N>9), the program will also calculate the values of t along with the associated twotailed probability values. For the original correlations, df=N—2; for the firstorder partials, df=N—3; and for the secondorder partials, df=N—4.
All P values are nondirectional (twotailed).
1st Order Partial Correlations

2nd Order Partial Correlations

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©Richard Lowry 2001
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