Using data describing entry into preschool among children with special needs, this paper introduces the fundamental statistical quantities of event occurrence--hazard and survivor functions. The paper discusses construction of formal statistical models of event occurrence over time, predictors that can be included in hazard models, and importance…

In response to O'Brien et al., who examined predictors of child outcomes among at-risk infants, this article suggests that the goal of prevention and early detection can be more efficiently met if the focus shifts from prediction to ongoing monitoring of children's developmental growth. A three-step model involving ongoing screening, eligibility…