Rat data from Gail et al.
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.
rats2 data(cancer, package="survival")
| rat: | id |
| trt: | treatment,(1=drug, 0=control) |
| observation: | within rat |
| start: | entry time |
| stop: | exit time |
| status: | event status, 1=tumor, 0=censored |
MH Gail, TJ Santner, and CC Brown (1980), An analysis of comparative carcinogenesis experiments based on multiple times to tumor. Biometrics 36, 255–266.
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