- x
result of the `cox.zph`

function.

- resid
a logical value, if `TRUE`

the residuals are included on the plot, as well as the smooth fit.

- se
a logical value, if `TRUE`

, confidence bands at two standard errors
will be added.

- df
the degrees of freedom for the fitted natural spline, `df=2`

leads
to a linear fit.

- nsmo
number of points to use for the lines

- var
the set of variables for which plots are desired. By default, plots are
produced in turn for each variable of a model. Selection of a single variable
allows other features to be added to the plot, e.g., a horizontal line at
zero or a main title.

This has been superseded by a subscripting method; see the example below.

- hr
if TRUE, label the y-axis using the estimated hazard ratio
rather than the estimated coefficient. (The plot does not change,
only the axis label.)

- xlab
label for the x-axis of the plot

- ylab
optional label for the y-axis of the plot. If missing a
default label is provided. This can be a vector of labels.

- lty, col, lwd
line type, color, and line width for the overlaid
curve. Each of these can be vector of length 2, in which case the
second element is used for the confidence interval.

- plot
if FALSE, return a list containing the x and y values of
the curve, instead of drawing a plot

- ...
additional graphical arguments passed to the `plot`

function.