Extract a column from an event history object.

Extract a column from an event history object, as obtained with the function Hist.

getEvent(object, mode = "factor", column = "event")

Arguments

object

Object of class "Hist".

mode

Return mode. One of "numeric", "character", or "factor".

column

Name of the column to extract from the object.

Details

Since objects of class "Hist" are also matrices, all columns are numeric or integer valued. To extract a correctly labeled version, the attribute states of the object is used to generate factor levels.

See also

Hist

Author

Thomas Alexander Gerds <tag@biostat.ku.dk>

Examples

  dat= data.frame(time=1:5,event=letters[1:5])
  x=with(dat,Hist(time,event))
  ## inside integer
  unclass(x)
#>      time status event
#> [1,]    1      1     1
#> [2,]    2      1     2
#> [3,]    3      1     3
#> [4,]    4      1     4
#> [5,]    5      1     5
#> attr(,"states")
#> [1] "a" "b" "c" "d" "e"
#> attr(,"cens.type")
#> [1] "uncensored"
#> attr(,"cens.code")
#> [1] "0"
#> attr(,"model")
#> [1] "competing.risks"
#> attr(,"entry.type")
#> [1] ""
  ## extract event (the extra level "unknown" is for censored data)
  getEvent(x)
#> [1] a b c d e
#> Levels: a b c d e unknown