cd4 {lqmix}

CD4 Data

Description

The cd4 data frame is made by a total of 2376 rows and 8 columns providing information on CD4 cell counts of 369 subjects followed for a maximum of 12 measurement occasions.

Usage

data(cd4)

Format

A data frame with 2376 observations on the following 8 variables:

sbj.id

subject id

time.id

time id

count

CD4 count

lcount

log(CD4 count + 1)

time

years since seroconversion

age

age (yrs) centered around 30

packs

packs of cigarettes per day

partners

number of sexual partners

drugs

recreational drug use indicator

cesd

depression score

Details

Multi-center AIDS Cohort Study providing a total of 2376 CD4+ cell counts of 369 HIV-infected men covering a period of approximately eight and half years. The number of measurements for each individual varies from 1 to 12. The CD4+ cell data are highly unbalanced.

References

Zeger, Scott L., and Peter J. Diggle. "Semiparametric models for longitudinal data with application to CD4 cell numbers in HIV seroconverters." Biometrics (1994): 689-699.