format
The data frame has the following components:
- lcavol: log(cancer volume)
- lweight: log(prostate weight)
- age: age
- lbph: log(benign prostatic hyperplasia amount)
- svi: seminal vesicle invasion
- lcp: log(capsular penetration)
- gleason: Gleason score
- pgg45: percentage Gleason scores 4 or 5
- lpsa: log(prostate specific antigen)
source
Stamey, T.A., Kabalin, J.N., McNeal, J.E., Johnstone, I.M., Freiha,
F., Redwine, E.A. and Yang, N. (1989).
Prostate specific antigen in the diagnosis and treatment of
adenocarcinoma of the prostate: II. radical prostatectomy treated
patients,
Journal of Urology 141(5), 1076--1083.