survival data frame has 14 rows and 2 columns.
The data measured the survival percentages of batches of rats who were given varying doses of radiation. At each of 6 doses there were two or three replications of the experiment.
Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.
Documentation reproduced from package boot, version 1.3-18. License: Unlimited