lines.survtab {popEpi}

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))