Analysis of both the standardized regression weights and the structure coefficients suggests that despite
multicollinearity between adherence reports and family functioning, adherence is related to metabolic control.
However, analysis of regression structure coefficients (child report of adherence rs =.67, parent report of adherence rs =.59), which are not suppressed or inflated by collinearity, demonstrates that beta weights for adherence are low because of
multicollinearity between predictors, not poor relations with the outcome variable.
This presence of
multicollinearity between values of adherence and the family variables is as would be expected.
Before testing the moderating effects, the two predictor variables (social support and family function) were standardized to reduce problems associated with
multicollinearity between the interaction term and the main effects (Frazier et al., 2004).
However, there was not a strong
multicollinearity between velocity and our other predictor variables (tolerance values for velocity: amphibians = 0.51, mammals = 0.49, birds = 0.52, values differ due to the use of different predictor variable subsets).
Not exact matches
We did not include age as a covariate due to the high correlation
between age and generation (r =.83) and the possible problems with
multicollinearity.
Additionally, the correlation
between any two variables did not reach the mean scale reliability, which shows no evidence of
multicollinearity according to Campbell and Fiske (1959).
In the current study, although
multicollinearity was not indicated, there was a significant correlation
between the two subscales of the HADS.
[jounal] Marsh, H. W. / 2004 / Why
multicollinearity matters: A reexamination of relations
between self - efficacy, self - concept, and achievement / Journal of Educational Psychology 96 (3): 518 ~ 522