# gehan

From MASS v7.3-47
by Brian Ripley

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both withdrawn from the trial when either came out of remission.

- Keywords
- datasets

##### 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.

##### References

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

##### Examples

`library(MASS)`

```
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 = "exponential")
summary(survreg(Surv(time, cens) ~ treat, gehan, dist = "exponential"))
summary(survreg(Surv(time, cens) ~ treat, gehan))
gehan.cox <- coxph(Surv(time, cens) ~ treat, gehan)
summary(gehan.cox)
```

*Documentation reproduced from package MASS, version 7.3-47, License: GPL-2 | GPL-3*

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