lines.survtab: 'lines' method for survtab objects

In popEpi: Functions for Epidemiological Analysis using Population Data

lines method for survtab objects

Description

Plot lines from a survtab object

Usage

## S3 method for class 'survtab'
lines(x, y = NULL, subset = NULL, conf.int = TRUE, col = NULL, lty = NULL, ...)

Arguments

x	a survtab output object
y	a variable to plot; a quoted name of a variable in x; e.g. y = "surv.obs"; if NULL, picks last survival variable column in order in x
subset	a logical condition; obj is subset accordingly before plotting; use this for limiting to specific strata, e.g. subset = sex == "male"
conf.int	logical; if TRUE, also plots any confidence intervals present in obj for variables in y
col	line colour passed to matlines
lty	line type passed to matlines
...	additional arguments passed on to to a matlines call; e.g. lwd can be defined this way

Value

Always returns NULL invisibly. This function is called for its side effects.

Author(s)

Joonas Miettinen

See Also

Other survtab functions: Surv(), plot.survtab(), print.survtab(), summary.survtab(), survtab(), survtab_ag()

Examples

data(sire)
data(sibr)
si <- rbind(sire, sibr)
si$period <- cut(si$dg_date, as.Date(c("1993-01-01", "2004-01-01", "2013-01-01")), right = FALSE)
si$cancer <- c(rep("rectal", nrow(sire)), rep("breast", nrow(sibr)))
x <- lexpand(si, birth = bi_date, entry = dg_date, exit = ex_date,
             status = status %in% 1:2,
             fot = 0:5, aggre = list(cancer, period, fot))
st <- survtab_ag(fot ~ cancer + period, data = x,
                 surv.method = "lifetable", surv.type = "surv.obs")

plot(st, "surv.obs", subset = cancer == "breast", ylim = c(0.5, 1), col = "blue")
lines(st, "surv.obs", subset = cancer == "rectal", col = "red")

## or
plot(st, "surv.obs", col = c(2,2,4,4), lty = c(1, 2, 1, 2))

popEpi documentation built on April 4, 2025, 2:51 a.m.