# Surv-methods

##### Methods for Surv objects

The list of methods that apply to `Surv`

objects

- Keywords
- survival

##### Usage

```
# S3 method for Surv
anyDuplicated(x, ...)
# S3 method for Surv
as.character(x, ...)
# S3 method for Surv
as.data.frame(x, ...)
# S3 method for Surv
as.integer(x, ...)
# S3 method for Surv
as.matrix(x, ...)
# S3 method for Surv
as.numeric(x, ...)
# S3 method for Surv
c(...)
# S3 method for Surv
duplicated(x, ...)
# S3 method for Surv
format(x, ...)
# S3 method for Surv
head(x, ...)
# S3 method for Surv
is.na(x)
# S3 method for Surv
length(x)
# S3 method for Surv
mean(x, ...)
# S3 method for Surv
median(x, ...)
# S3 method for Surv
names(x)
# S3 method for Surv
names(x) <- value
# S3 method for Surv
quantile(x, probs, na.rm=FALSE, ...)
# S3 method for Surv
plot(x, ...)
# S3 method for Surv
rep(x, ...)
# S3 method for Surv
rep.int(x, ...)
# S3 method for Surv
rep_len(x, ...)
# S3 method for Surv
rev(x)
# S3 method for Surv
t(x)
# S3 method for Surv
tail(x, ...)
# S3 method for Surv
unique(x, ...)
```

##### Arguments

- x
a

`Surv`

object- probs
a vector of probabilities

- na.rm
remove missing values from the calculation

- value
a character vector of up to the same length as

`x`

, or`NULL`

- …
other arguments to the method

##### Details

These functions extend the standard methods to `Surv`

objects.
The arguments and results from these are mostly as expected, with the
following further details:

The

`as.character`

function uses "5+" for right censored at time 5, "5-" for left censored at time 5, "[2,7]" for an observation that was interval censored between 2 and 7, "(1,6]" for a counting process data denoting an observation which was at risk from time 1 to 6, with an event at time 6, and "(1,6+]" for an observation over the same interval but not ending with and event. For a multi-state survival object the type of event is appended to the event time using ":type".The

`print`

and`format`

methods make use of`as.character`

.The

`as.numeric`

and`as.integer`

methods perform these actions on the survival times, but do not affect the censoring indicator.The

`as.matrix`

and`t`

methods return a matrixThe

`length`

of a`Surv`

object is the number of survival times it contains, not the number of items required to encode it, e.g.,`x <- Surv(1:4, 5:9, c(1,0,1,0)); length(x)`

has a value of 4. Likewise`names(x)`

will be NULL or a vector of length 4. (For technical reasons, any names are actually stored in the`rownames`

attribute of the object.)For a multi-state survival object

`levels`

returns the names of the endpoints, otherwise it is NULL.The

`median`

,`quantile`

and`plot`

methods first construct a survival curve using`survfit`

, then apply the appropriate method to that curve.The concatonation method

`c()`

is asymmetric, its first argument determines the exection path. For instance`c(Surv(1:4), Surv(5:6))`

will concatonate the two objects,`c(Surv(1:4), 5:6)`

will give an error, and`c(5:6, Surv(1:4))`

is equivalent to`c(5:6, as.vector(Surv(1:4)))`

.

##### See Also

*Documentation reproduced from package survival, version 3.1-8, License: LGPL (>= 2)*