Restricts bivariate survival data to a rectangular time region defined by left-truncation and right-censoring boundaries, for use with piecewise twostage models.
Usage
surv_boxarea(
left.trunc,
right.cens,
data,
timevar = "time",
status = "status",
id = "id",
covars = NULL,
covars.pairs = NULL,
num = NULL,
silent = 1,
boxtimevar = "boxtime"
)Arguments
- left.trunc
vector of length 2 giving left truncation times.
- right.cens
vector of length 2 giving right censoring times.
- data
a data.frame with the survival data.
- timevar
name of the time variable.
- status
name of the status variable.
- id
name of the cluster identifier.
- covars
optional covariate names.
- covars.pairs
optional pair-level covariate names.
- num
within-cluster numbering variable name.
- silent
verbosity level (1=silent).
- boxtimevar
name for the created box-time variable.