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
data(rats)
Arguments
format
ll{
rat: id
rx: treatment,(1=drug, 0=control)
observation: within rat
start: entry time
stop: exit time
status: event status
}
source
Gail, Sautner and Brown, Biometrics 36, 255-66, 1980