Key points are not available for this paper at this time.
Whenever two supposedly independent variables are highly correlated, it will be difficult to assess their relative importance in determining some dependent variable. The hligher the correlation between independent variables the greater the sampling error of the partials. Numerical examples are given to illustrate the practical implications for social research.
H. M. Blalock (Sun,) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: