eha (version 1.2-18)

risksets: 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.

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.

Details

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

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))