leuk {MASS}R Documentation

Survival Times and White Blood Counts for Leukaemia Patients

Description

A data frame of data from 33 leukaemia patients.

Arguments

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

Format

A data frame with columns:

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

library(survival5)
data(leuk)
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)

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