Harrell's concordance index (C-statistic).

Uses survival::concordance() (which handles ties + censoring correctly).

Usage

morie_survival_concordance(time, event, risk_score)

Arguments

time

Numeric vector of event/censoring times.

event

Integer/logical vector; 1 = event, 0 = censored.

risk_score

Numeric vector of predicted risk scores aligned with time for concordance / discrimination metrics.