Prostate {lasso2}R Documentation

Prostate Cancer Data

Description

These data come from a study that examined the correlation between the level of prostate specific antigen and a number of clinical measures in men who were about to receive a radical prostatectomy. It is data frame with 97 rows and 9 columns.

Usage

data(Prostate)

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.

Examples

data(Prostate)
attach(Prostate)
pairs(Prostate, col = 1+svi, pch = gleason - 5,
      main = paste("Prostate data, n = ", nrow(Prostate)))
detach()

l1c.P <- l1ce(lcavol ~ ., data = Prostate)
coef(l1c.P)[coef(l1c.P) != 0] ## only age, lcp, lpsa (+ intercept)
summary(l1c.P)

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Last updated with Webcuts support: Thu Nov 27 17:31:33 MET 2003