SMPracticals (version 1.4-3.1)

mice: Mice Deaths from Radiation

Description

RFM male mice were exposed to 300 rads of x-radiation at 5--6 weeks of age. The causes of death were thymic lymphoma, reticulum cell sarcoma, and other. Some of the mice were kept in a conventional environment, and the others in a germ-free environment.

Usage

data(mice)

Format

A data frame with 177 observations on the following 4 variables.

type

Environment type (factor)

cause

Cause of death

status

Censoring indicator, with 1 indicating death

y

Age at death (weeks)

References

Davison, A. C. (2003) Statistical Models. Cambridge University Press. Page 200.

Examples

data(mice)
library(survival)
fit <- survfit(Surv(y,status)~cause,data=mice[1:95,]) # first group
plot(fit,lty=c(3,2,1))