Add N

For each survfit() object summarized with tbl_survfit() this function will add the total number of observations in a new column.

Usage

# S3 method for class 'tbl_survfit'
add_n(x, ...)

Arguments

x

object of class "tbl_survfit"

...

Not used

Examples

library(survival)
fit1 <- survfit(Surv(ttdeath, death) ~ 1, trial)
fit2 <- survfit(Surv(ttdeath, death) ~ trt, trial)

# Example 1 ----------------------------------
list(fit1, fit2) |>
  tbl_survfit(times = c(12, 24)) |>
  add_n()


  
Characteristic
      
N
      
Time 12
      
Time 24
    
Overall
200
89% (84%, 93%)
44% (38%, 51%)
Chemotherapy Treatment
200



    Drug A


91% (85%, 97%)
47% (38%, 58%)
    Drug B


86% (80%, 93%)
41% (33%, 52%)