Anxious Solitude, Unsociability, and Peer Exclusion in Middle Childhood: A Multitrait-Multimethod Matrix

This study examines convergent and divergent validity for middle childhood anxious solitude, unsociability, and peer exclusion as assessed by five informants (peers, teachers, observers, the self, and parents). Participants were 163 (67 male, 96 female) third grade children ( M age = 8.70 years). Parent reports were available for a subset of the sample (N = 95). Validity was analyzed via multitrait–multimethod correlation matrices and structural...