timereg (version 2.0.1)

cd4: The multicenter AIDS cohort study

Description

CD4 counts collected over time.

Format

This data frame contains the following columns:

obs

a numeric vector. Number of observations.

id

a numeric vector. Id of subject.

visit

a numeric vector. Timings of the visits in years.

smoke

a numeric vector code. 0: non-smoker, 1: smoker.

age

a numeric vector. Age of the patient at the start of the trial.

cd4

a numeric vector. CD4 percentage at the current visit.

cd4.prev

a numeric vector. CD4 level at the preceding visit.

precd4

a numeric vector. Post-infection CD4 percentage.

lt

a numeric vector. Gives the starting time for the time-intervals.

rt

a numeric vector. Gives the stopping time for the time-interval.

References

Kaslow et al. (1987), The multicenter AIDS cohort study: rational, organisation and selected characteristics of the participants. Am. J. Epidemiology 126, 310--318.

Examples

# NOT RUN {
data(cd4)
names(cd4)
# }