Using data from the Dunedin Study, Moffitt [1993] identified those boys who both scored above average on a measure of antisocial behavior at seven different ages and who were rated as highly antisocial by three different sources (parents, teachers, and self)—5% of the sample. For the entire sample, Moffitt reported a stability coefficient of .28 for teacher ratings, but when she excluded the 5% of chronically aggressive and antisocial individuals, she found a stability coefficient of .16. Loeber [1982] reanalyzed the data, and reported on other researchers’ re-analyses of the data, from some of the most widely cited studies on the continuity of aggression to examine this issue. For example, Loeber cited Patterson’s [1982] re-analysis of the 10-year data from the Columbia County Longitudinal Study described above. Lefkowitz et al. [1977] obtained a stability coefficient of .38 from age 8 to 19 for the sample as a whole. When Patterson broke down the sample by level of peer-nominated aggression at age 8 into various percentile ranges (85th–89th, 90th–94th, and ≥95th), he found that a higher percentage (38.5%) of children who
