Growth mixture models (GMMs) are applied to intervention studies with repeated measures to explore heterogeneity in the intervention effect. However, traditional GMMs are known to be difficult to estimate, especially at sample sizes common in single-center interventions. Common strategies to coerce GMMs to converge involve post hoc adjustments to…

Growth mixture models (GMMs) are applied to intervention studies with repeated measures to explore heterogeneity in the intervention effect. However, traditional GMMs are known to be difficult to estimate, especially at sample sizes common in single-center interventions. Common strategies to coerce GMMs to converge involve post-hoc adjustments to…

Background: The literature on the prevalence of mental disorders affecting children and adolescents has expanded significantly over the last three decades around the world. Despite the field having matured significantly, there has been no meta-analysis to calculate a worldwide-pooled prevalence and to empirically assess the sources of…

Established and novel multivariate methods were used to examine informants' rankings of 73 motives/causes for truancy. Five main relatively homogeneous clusters of motives/causes emerged, two covering a previously recognized pattern of parent-condoned truancy, and three related to recognized syndromes of adolescent delinquency. It was suggested…

This study used a person-oriented approach to examine links between adolescents' experiences with parents and peers. Cluster analysis classified 361, White, working- and middle-class youth (mean age = 12.16 years) based on mothers' and fathers' reports of parental acceptance and adolescents' reports of perceived peer competence. Three patterns…

The consciousness of dizygotic twins in their communication of actions and events as seen in the visual cliff pictures published by E. J. Gibson and R. D. Walk (1960) was studied in Sweden. In the process of communication, many different state spaces are generated. The methodology demonstrates that ecological and biophysical properties of language…

Compared the efficacy of two methods of cluster analysis, the unweighted pair-groups method using arithmetic averages (UPGMA) and Ward's method, for students grouped on intelligence, achievement, and social adjustment by both clustering methods. Found UPGMA more efficacious based on output, on cophenetic correlation coefficients generated by each…

This study examined preliminary effectiveness of one of the first Project Re-ED (Re-education of Emotionally Disturbed children) residential treatment centers for children. Data were collected at admission, at discharge, and up to 6 months postdischarge. Findings show substantial decreases in problem behaviors and improvements in personal…

This study was conducted to determine whether the filmic coding elements of split screen, slow motion, generated line cues, the zoom of a camera, and rotation could aid in the development of the Euclidean space concepts of horizontality and verticality, and to explore presence and development of spatial skills involving these two concepts in…

Posits a multidimensional measurement theory of adolescent drug involvement and tests its measurement properties as captured in the Drug Involvement Scale for Adolescents (DISA). Results attest to the reliability, validity, and brevity (22 indicators constructed from 29 items) of this composite index. Recommends further validation of the DISA.…