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

### 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 2.39-4 Index]