Compute the list of individuals at risk at landmark times

Usage

# S4 method for class 'LandmarkAnalysis'
compute_risk_sets(x, landmarks, .warn_when_less_than = 0, ...)

Arguments

x: An object of class LandmarkAnalysis.
landmarks: Numeric vector of landmark times
.warn_when_less_than: Integer indicating that a warning will be raised when the number of observations prior to a landmark time is less than that integer for certain individuals.
...: Additional arguments (not used)

Value

An object of class LandmarkAnalysis, including desired risk sets for the relevant landmark times.

Details

A risk set describes all subjects still at risk (i.e., not experienced the event of interest or censored) at a given time. In LandmarkAnalysis, risk sets define which subjects should be included in the longitudinal and survival sub-models for each landmark time.

The risk sets are stored in the risk_sets slot of the LandmarkAnalysis object, where each risk set is a list of indices corresponding to the subjects at risk at the respective landmark time.