rats {survival}R Documentation

Rat data from survival5

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

rats

Format

rat: id
rx: treatment,(1=drug, 0=control)
observation: within rat
start: entry time
stop: exit time
status: event status

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 2.31 Index]