landmarked - Plot Adjusted Kaplan-Meier Estimates from a Landmark Time

Plots contextual landmark Kaplan-Meier curves. An extension of the 'survminer::ggsurvplot()' function that allows the specification of a landmark time and an optional label. The period before the landmark is displayed as a pooled survival curve, while curves beyond the landmark are presented according to the groups defined in the supplied 'survival::survfit' object.