The colon cancer data

Description

Colon cancer data with 929 rows and 8 columns. There is one row per person. The original data have 16 columns and two records per person and are available as part of survival Package. These are data from one of the first successful trials of adjuvant chemotherapy for colon cancer. Levamisole is a low-toxicity compound previously used to treat worm infestations in animals; 5-FU is a moderately toxic (as these things go) chemotherapy agent.

Usage

data("colonTPreg")

Format

A data frame with 929 observations on the following 8 variables.

id

identification variable.

Zt

recurrence free survival time, that is the minimum of recurrence, death, and censoring time.

Tt

total survival time, time to death or censoring

delta1

recurrence free survival indicator, 0=alive and recurrence free, 1=dead or relapsed.

delta

status indicator, 0=alive, 1=dead.

Nodes

number of lymph nodes with detectable cancer.

Age

age in years.

treatment

a factor with levels Obs, Lev and Lev+5FU