| rats2 {survival} | R Documentation |
Rat data from Gail et al.
Description
48 rats were injected with a carcinogen, and then randomized to either drug or placebo. The number of tumors ranges from 0 to 13; all rats were censored at 6 months after randomization.
Usage
rats2
Format
| rat: | id |
| trt: | treatment,(1=drug, 0=control) |
| observation: | within rat |
| start: | entry time |
| stop: | exit time |
| status: | event status, 1=tumor, 0=censored |
Note
The usage above assumes that the survival package is attached via
library(survival) or via another package that depends on
survival, e.g., mstate. If not, then either survival::rats2
can be used or data(cancer, package="survival").
Source
MH Gail, TJ Santner, and CC Brown (1980), An analysis of comparative carcinogenesis experiments based on multiple times to tumor. Biometrics 36, 255–266.
[Package survival version 3.8-12 Index]