ABSTRACT
The data to be analyzed in this chapter are on 131 heroin addicts in two different clinics receiving methadone maintenance treatment to help them overcome their addiction. Early dropout is an important problem with this treatment. We will therefore analyze the time from admission to termination of treatment (in days), given as time in Table 12.1. For patients still in treatment when these data were collected, time is the time from admission to the time of data collection. The variable status is an indicator for whether time refers to dropout (1) or end of study (0). Possible explanatory variables for retention in treatment are maximum methadone dose and a prison record as well as which of two clinics the addict was treated in. These variables are called dose, prison, and clinic, respectively. The data were first analyzed by Caplehorn and Bell (1991) and also appear in Hand et al. (1994).
