Semipartial Correlation

Some articles on semipartial correlation, semipartial, correlation, correlations:

Partial Correlation - Semipartial Correlation (part Correlation)
... The semipartial (or part) correlation statistic is similar to the partial correlation statistic ... after certain factors are controlled for, but to calculate the semipartial correlation one holds the third variable constant for either X or Y, whereas for partial correlations one holds the ... The semipartial correlation measures unique and joint variance while the partial correlation measures unique variance ...