A 2007 study of women in Miami (Brewer et al., Ann Epidemiol.
17:533-539) examined the link between HIV status and high-risk
sexual activity. Eligible participants were female, at least 18
years of age, English-speaking, self-reported having vaginal or
anal sex in the past 30 days, and self-reported having smoked crack
or snorted or injected cocaine or heroin in the last 30 days and
having not been in drug treatment in the last 30 days. The data set
HIVrisk.dta contains two...