the bivariate regression analyses) and allowed the component score to correlate with the common factor representing the shared variance among symptom counts of all disorders. Further, the variance unique to each disorder was allowed to correlate with each component, one at a time, to see if any such correlations were significant. For both PC2 and PC3, the correlation with the common factor was approximately r = −.20 and was highly significant, indicating that those higher in externalizing tendencies had smaller component scores. Correlations with the common factor were larger than the zero-order correlations with any of the symptom counts. Significant negative correlations between disorder-unique variance and the TF component would indicate that the component was associated with additional variance in the disorder not accounted for by what the disorder shares with the common factor. This was not the case for any of the disorders.
