R language uses data set veteran for survival analysis

The first code block loads the required package , And the veteran Data sets ,survival It includes two treatments from lung cancer 、 Data from randomized trials .

library(survival)
library(ranger)
library(ggplot2)
library(dplyr)
library(ggfortify)

#------------
data(veteran)
head(veteran)
## trt celltype time status karno diagtime age prior
## 1 1 squamous 72 1 60 7 69