SurvTest {coin} | R Documentation |
## S3 method for class 'formula': surv_test(formula, data, subset = NULL, weights = NULL, ...) ## S3 method for class 'IndependenceProblem': surv_test(object, alternative = c("two.sided", "less", "greater"), distribution = c("asympt", "approx", "exact"), ...)
formula |
a formula of the form Surv(time, event) ~ x | block where
time is a positive numeric variable denoting the survival time and
event is a logical being TRUE when the event of interest
was observed and FALSE in case of censoring. x is a factor
with two or more levels giving the corresponding groups. block is an
optional factor for stratification. |
data |
an optional data frame containing the variables in the model formula. |
subset |
an optional vector specifying a subset of observations to be used. |
weights |
an optional formula of the form ~ w defining
integer valued weights for the observations. |
object |
an object of class IndependenceProblem . |
alternative |
a character, the alternative hypothesis must be
one of "two.sided" (default), "greater" or
"less" . You can specify just the initial letter. |
distribution |
a character, the null distribution of the test statistic
can be computed exact ly or can be approximated by its
asymptotic distribution (asympt )
or via Monte-Carlo resampling (approx ). |
... |
further arguments to be passed to or from methods. |
The null hypothesis of the equality of the distribution of the survival
functions in the groups induced by x
is tested.
An object inheriting from class IndependenceTest-class
with
methods show
, statistic
, expectation
,
covariance
and pvalue
. The null distribution
can be inspected by pperm
, dperm
,
qperm
and support
methods.
data(ocarcinoma, package = "coin") surv_test(Surv(time, event) ~ stadium, data = ocarcinoma, distribution = "exact")