Furthermore, data-mining methods like tree-based approaches or random forests may effectively capture moderation effects associated with antidepressant and antipsychotic use and weight gain (Yoo et al. 2012).
Model 2 added patient characteristics at Level 2; analysis was restricted to the 8 candidate moderators that showed univariate moderation effects.
To determine whether the effect was a mediating or moderating influence, we additionally examined moderation effects of the FPCN on the DN or SN relationships to cognition (Fig. 5, right).
Fortunately, most published papers in which the univariate moderation model was used concern moderation effects of family-level moderators such as SES, parental educational attainment level, or the age of the twins, i.e., variables that are by definition equal in both twins.
Alpha for inferences of significance of group main effects was set at p < 0.05, while alpha for inferences of significant moderation effects was corrected for the number of moderator categories (i.e., p < 0.017 for 3 categories).
Besides the small moderation effects on the variances, significant effects of the moderators on the means were observed in this study.
Irrespective of the exact nature of the moderating mechanism, the present study set out to test whether similar moderation effects of parental educational attainment level can be detected for adulthood psychometric IQ scores, as has been observed for childhood IQ.
Furthermore, we hypothesized a specific pattern of moderation effects.
Analysis of moderation effects showed no moderation effects for children's socioeconomic status or for non-Danish children.
Finally, the moderation effects of age × gender could not be identified.
The interaction between age and gender did not reveal significant moderation effects.
