Calculate Harrell's C-index with 95% CI
Usage
cindex_calc(model, newdata = NULL, digits = 3)
Arguments
- model
a 'coxph' object
- newdata
optional validation dataset
- digits
number of decimal places for rounding (default 3).
Value
numeric vector of C-index (lower, upper)
Examples
library(survival)
fit <- coxph(Surv(time, status) ~ age + sex, data = lung)
cindex_calc(fit)
#> Cindex Lower Upper
#> 0.603 0.553 0.653