- x
a survival object, generated from the `survfit`

or `survexp`

functions.

- type
the line type, as described in `lines`

. The default is a step function
for `survfit`

objects, and a connected line for `survexp`

objects.
All other arguments for `lines.survexp`

are identical to those
for `lines.survfit`

.

- col, lty, lwd, cex
vectors giving the mark symbol, color, line type, line width and
character size for the added curves. Of this set only color is
applicable to `points`

.

- pch
plotting characters for points, in the style of
`matplot`

, i.e., either a single string of characters of which
the first will be used for the first curve, etc; or a vector
of characters or integers, one element per curve.

- mark
a historical alias for `pch`

- censor
should censoring times be displayed for the `points`

function?

- mark.time
controls the labeling of the curves.
If `FALSE`

, no labeling is done.
If `TRUE`

, then curves are marked at each censoring time.
If `mark.time`

is a numeric vector, then curves are marked at
the specified time points.

- xmax
optional cutoff for the right hand of the curves.

- fun
an arbitrary function defining a transformation of the survival curve.
For example `fun=log`

is an alternative way to draw a log-survival curve
(but with the axis labeled with log(S) values).
Four often used transformations can be specified with a character
argument instead: "log" is the same as using the `log=T`

option,
"event" plots cumulative events (f(y) = 1-y),
"cumhaz" plots the cumulative hazard function (f(y) = -log(y))
and "cloglog" creates a complimentary log-log survival plot
(f(y) = log(-log(y))) along with log scale for the x-axis.

- conf.int
if `TRUE`

, confidence bands for the curves are also plotted.
If set to `"only"`

, then only the CI bands are plotted, and the curve
itself is left off.
This can be useful for fine control over the colors or line types of a
plot.
A numeric value, e.g. `conf.int = .90`

, can be used to

- conf.times
optional vector of times at which to place a
confidence bar on the curve(s). If present, these will be used
instead of confidence bands.

- conf.cap
width of the horizontal cap on top of the confidence
bars; only used if conf.times is used. A value of 1 is the width of
the plot region.

- conf.offset
the offset for confidence bars, when there are
multiple curves on the plot. A value of 1 is the width of the plot
region. If this is a single number then each curve's bars are offset
by this amount from the prior curve's bars, if it is a vector the values are
used directly.

- conf.type
One of `"plain"`

, `"log"`

(the default),
`"log-log"`

, `"logit"`

, or `"none"`

. Only
enough of the string to uniquely identify it is necessary.
The first option causes confidence intervals not to be
generated. The second causes the standard intervals
`curve +- k *se(curve)`

, where k is determined from
`conf.int`

. The log option calculates intervals based on the
cumulative hazard or log(survival). The log-log option bases the
intervals on the log hazard or log(-log(survival)), and the
logit option on log(survival/(1-survival)).

- noplot
for multi-state models, curves with this label will not
be plotted. The default corresponds to an unspecified state.

- cumhaz
plot the cumulative hazard, rather than the survival or
probability in state.

- ...
other graphical parameters