ABSTRACT
Individuals observed over time may experience multiple events of the same type, or a number of events of dierent types. Studies in which there are repeated occurrences of the same type of event, such as a headache or asthmatic attack, are frequently encountered and techniques are needed to model the dependence of the rate at which such events occur on characteristics of the individuals or exposure factors. Multiple event data also arise when an individual may experience a number of outcomes of dierent types, with interest centering on factors aecting the time to each of these outcomes. Where the occurrence of one event precludes the occurrence of all others, we have the competing risks situation considered in Chapter 12, but in this chapter we consider situations where this is not necessarily the case.
