gehan {MASS} | R Documentation |

## Remission Times of Leukaemia Patients

### Description

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both withdrawn from the trial when either came out of remission.

### Usage

gehan

### Format

This data frame contains the following columns:

`pair`

- label for pair
`time`

- remission time in weeks
`cens`

- censoring, 0/1
`treat`

- treatment, control or 6-MP

### Source

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.

### References

Venables, W. N. and Ripley, B. D. (2002)
*Modern Applied Statistics with S.* Fourth edition. Springer.

### Examples

library(survival)
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)

[Package

*MASS* version 7.2-33

Index]