risksets {eha}R Documentation

Finds the compositions and sizes of risk sets

Description

Focus is on the risk set composition just prior to a failure.

Usage

risksets(x, strata, max.survs)

Arguments

x A Surv object.
strata Stratum indicator.
max.survs Maximum number of survivors in each risk set. If smaller than the 'natural number', survivors are sampled from the present ones.

Details

If the input argument max.survs is left alone, all survivors are accounted for in all risk sets.

Value

A list with components

antrs No. of risk sets in each stratum. The number of strata is given by length(antrs).
risktimes Ordered distinct failure time points.
eventset vector of pointers to events in each risk set.
riskset vector of pointers to the members of the risk sets, in order. The 'events' first are the events.
size The sizes of the risk sets.
n.events The number of events in each risk set.

Note

can be used to "sample the risk sets".

Author(s)

Göran Broström

See Also

table.events, coxreg.

Examples

 enter <- c(0, 1, 0, 0)
 exit <- c(1, 2, 3, 4)
 event <- c(1, 1, 1, 0)
 risksets(Surv(enter, exit, event))

[Package eha version 1.2-4 Index]