This study examined associations between perceived popularity trajectories and changes in proactive and reactive aggression in middle adolescence. The sample included 1,374 adolescents from 5 cohorts who were followed from Grade 7 to Grade 9 (49% males, M[subscript age] = 12.67 years, SD = 0.67). Popularity trajectories were identified based on…

Identifying change at the individual level is an important goal for researchers, educators, and clinicians. We present a set of statistical procedures for identifying individuals who depart from a normative change. Using Latent Change Scores models (LCS), we illustrate how the Individual Likelihood computed from a statistical model for change…