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 The trial was designed as matched pairs, both withdrawn from the trial when either came out of remission.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

    data(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)

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