A data frame of data from 33 leukaemia patients.
A data frame with columns:
"present"
or
"absent"
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.
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)