Veteran's Administration lung cancer trial from Kalbfleisch & Prentice.
VAA data frame with columns:
stimesurvival or follow-up time in days.
statusdead or censored.
treattreatment: standard or test.
agepatient's age in years.
KarnKarnofsky score of patient's performance on a scale of 0 to 100.
diag.timetimes since diagnosis in months at entry to trial.
cellone of four cell types.
priorprior therapy?
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.