gehan {MASS} | R Documentation |
A data frame from a trial of 42 leukaemia patients. Some were treated with the drug 6-mercaptopurine and the rest are controls. The trial was designed as matched pairs, both withdrawn from the trial when either came out of remission.
pair |
label for pair |
time |
remission time in weeks |
cens |
censoring, 0/1 |
treat |
treatment, control or 6-MP |
This data frame contains the following columns:
Cox, D. R. and Oakes, D. (1984) Analysis of Survival Data. Chapman & Hall, p. 7. Taken from
Gehan, E.A. (1965) A generalized Wilcoxon test for comparing arbitrarily single-censored samples. Biometrika 52, 203-233.
library(survival5) data(gehan) gehan.surv <- survfit(Surv(time, cens) ~ treat, data=gehan, conf.type="log-log") summary(gehan.surv) survreg(Surv(time, cens) ~ factor(pair) + treat, gehan, dist="exp") summary(survreg(Surv(time, cens) ~ treat, gehan, dist="exp")) summary(survreg(Surv(time, cens) ~ treat, gehan)) gehan.cox <- coxph(Surv(time, cens) ~ treat, gehan) summary(gehan.cox)