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st: Computing semipartial correlations

From   Richard Williams <>
Subject   st: Computing semipartial correlations
Date   Thu, 11 Dec 2003 11:54:05 -0500

The pcorr routine uses the following formula to compute partial correlations:

t/sqrt(t^2 + N - K -1) where N = Sample size and K = # of X variables

This is not the most intuitive formula in the world, but it works! I would like to modify the program to compute semipartial correlations. Does anybody know of a similarly straightforward formula that would do this? pcorr runs a regress command and then uses the saved estimates to do its calculations. Thanks for any input.

Richard Williams, Associate Professor
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