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