Return the states of a multi-state Surv object

For a multi-state Surv object, this will return the names of the states.

# S3 method for class 'Surv'
levels(x)

Arguments

x

a Surv object

Value

for a multi-state Surv object, the vector of state names (excluding censoring); or NULL for an ordinary Surv object

Examples

y1 <- Surv(c(1,5, 9, 17,21, 30),
           factor(c(0, 1, 2,1,0,2), 0:2, c("censored", "progression", "death")))
levels(y1)
#> [1] "progression" "death"      

y2 <- Surv(1:6, rep(0:1, 3))
y2
#> [1] 1+ 2  3+ 4  5+ 6 
levels(y2)
#> NULL