| 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.
rats
| rat: | id |
| rx: | treatment,(1=drug, 0=control) |
| observation: | within rat |
| start: | entry time |
| stop: | exit time |
| status: | event status |
MH Gail, TJ Santner, and CC Brown (1980), An analysis of comparative carcinogenesis experiments based on multiple times to tumor. Biometrics 36, 255–266.