eha: risksets – R documentation

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risksets

Finds the compositions and sizes of risk sets

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

risksets(
  x,
  strata = NULL,
  max.survs = NULL,
  members = TRUE,
  collate_sets = FALSE
)

`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. No sampling if missing.
`members`	If TRUE, all members of all risk sets are listed in the resulting list, see below.
`collate_sets`	logical. If TRUE, group information by risk sets in a list. Only if `members = TRUE`.

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

A list with components (if collate_sets = FALSE)

`antrs`	No. of risk sets in each stratum. The number of strata is given by `length(antrs)`.
`risktimes`	Ordered distinct failure time points.
`eventset`	If 'members' is TRUE, a vector of pointers to events in each risk set, else NULL.
`riskset`	If 'members' is TRUE, a vector of pointers to the members of the risk sets, in order. The 'n.events' first are the events. If 'members' is FALSE, 'riskset' is NULL.
`size`	The sizes of the risk sets.
`n.events`	The number of events in each risk set.
`sample_fraction`	If 'members' is TRUE, the sampling fraction of survivors in each risk set.

Can be used to "sample the risk sets".

Göran Broström

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

Event History Analysis

v2.10.0

GPL (>= 2)

Authors

Göran Broström [aut, cre], Jianming Jin [ctb]

Initial release

2022-04-17