Studies of large samples followed over long periods of time, in which a preventive intervention is targeted to a randomly selected part of an ‘at-risk’ group. The relative benefits and drawbacks should be compared to those carried out using the microgenetic method.
See ‘At-risk’ concept, Auto-regressive models, Follow-back design, Growth models, Longitudinal design, Longitudinal studies, Microgenetic method, Preventive interventions, Time-series