Rat treatment data from Mantel et al.
Three rats were chosen from each of 100 litters, one of which was
treated with a drug, and then all followed for tumor incidence.
Usage
rats
Arguments
Format
litter:
litter number from 1 to 100
rx:
treatment,(1=drug, 0=control)
time:
time to tumor or last follow-up
status:
event status, 1=tumor and 0=censored
References
E. W. Lee, L. J. Wei, and D. Amato,
Cox-type regression analysis for large number of small groups of
correlated failure time observations,
in "Survival Analysis, State of the Art", Kluwer, 1992.