`exnex_surv()` is deprecated in favour of [pooling_surv()]. It emits a one-line deprecation message and forces `pooling = "exnex"`, so existing calls continue to fit the EXNEX hierarchy unchanged.
Examples
if (FALSE) { # \dontrun{
fit <- exnex_surv(survival::Surv(time, event) ~ group, data = d)
} # }