The partly parametric and partly nonparametric additive risk model.

Aalen's linear hazard rate regression model is a useful and increasingly popular alternative to Cox' multiplicative hazard rate model. It postulates that an individual has hazard rate function [Formula: see text] in terms of his covariate values [Formula: see text]. These are typically levels of various hazard factors, and may also be time-dependent.

The cure model in perinatal epidemiology.

In the statistical literature, the class of survival analysis models known as cure models has received much attention in recent years. Cure models seem not, however, to be part of the statistical toolbox of perinatal epidemiologists. In this paper, we demonstrate that in perinatal epidemiological studies where one investigates the relation between a gestational exposure and a condition that can only be ascertained after several years, cure models may provide the correct statistical framework.