rats2: Rat data from Gail et al.

Description Usage Format Source

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

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2
rats2
data(cancer, package="survival")

Format

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

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.


survival documentation built on Aug. 24, 2021, 5:06 p.m.