The two
main predictor variables and the control variables were entered simultaneously.
The results showed that
both main predictor variables were significantly associated with the frequency of infectious diseases in the offspring.
Finally, it is a concern that the scores for
the main predictor variables were not normally distributed.
Not exact matches
After analyzing
main effects, we assessed interactions between various
predictor variables and treatment group.
We include as potential confounders any
variable that has been shown to be associated with bullying and has also been shown to be associated with any of the 3
main predictors.
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).
The internalizing x externalizing interaction factor was a statistically significant
predictor of the intercept for dichotomous
variables when it was specified at W1, W2, W4, and W5, βs = − 11.80 to − 3.23, ps < 0.05, and the nature of this interaction was similar to that described in our
main analysis with W3 specified as the intercept.
For example, if one were interested in whether the association between a parenting
variable (e.g., father psychological control; Holmbeck, Shapera, & Hommeyer, in press) and an outcome (e.g., school grades) is moderated by group status (e.g., spina bifida vs. an able - bodied comparison sample), one would test the interaction of psychological control and group as a
predictor of school grades after controlling for the parenting and group
main effects.