Survival Times and White Blood Counts for Leukaemia Patients

SUMMARY:

A data frame of data from 33 leukaemia patients.

DATA DESCRIPTION:

A data frame with columns:

ARGUMENTS:

wbc
white blood count
ag
a test result, "present" or "absent"
time
survival time in weeks

SOURCE:

Cox, D. R. and Oakes, D. (1984) Analysis of Survival Data, Chapman & Hall, p. 9.

Taken from

Feigl, P. & Zelen, M. (1965) Estimation of exponential survival probabilities with concomitant information. Biometrics 21, 826-838.

EXAMPLES:

plot(survfit(Surv(time) ~ ag, data=leuk), lty=2:3, col=2:3)
# now Cox models
leuk.cox <- coxph(Surv(time) ~ ag + log(wbc), leuk)
summary(leuk.cox)