get_sim_ci: Calculate simulation based confidence intervals
Description
These helpers draw the simulated hazard trajectories once for the whole
(possibly grouped) newdata via sim_hazard -- so one set
of draws is shared across groups -- and then summarise them into pointwise
quantile intervals. Cumulative quantities are accumulated within each group
of newdata.
Usage
get_sim_ci(newdata, object, alpha = 0.05, nsim = 100L, ...)