我在做COX回归列线图，前面代码都可以运行下去
install.packages("survival")
install.packages("rms")
library(survival)
library(rms)
setwd("C:/Users/Administrator/Desktop/survival/")
pancer<-read.csv("nom1.csv",header=T,sep = ",")
pancer<-as.data.frame(pancer)
as.matrix(head(pancer))
dd=datadist(pancer)
options(datadist="dd")
summary(pancer)
coxmodel1 <- cph(surv(time,censor==1)~T+N+FIB+CA199,x=T,y=T,data=pancer,surv = T)
#这里就报错误了：
Error in cph(surv(time, censor == 1) ~ T + N + FIB + CA199, x = T, y = T, :
response variable should be a Surv object
有没有大神教教哪里错了。