confIntArea: Adds a confident interval area of a survival model to a plot.

In survCurve: Plots Survival Curves Element by Element

Description

This function adds the confident interval area of one group (strata) of a survfit object to an existing plot. For competitive risk models, it draws the confidence interval of one group and one event; the event-number needs to be specified. If two overlapping confidence intervals are drawn (by two function calls) in one plot, the use of transparent color is recommended, for example "adjustcolor("red",0.1).

Usage

confIntArea(x, group, event, col = "grey", invert = FALSE)

Arguments

x	A survfit (survival-package) or a Cuminc (mstate-package) object.
group	Number of the group (=strata) of which the confidence interval should be plotted. If the survfit-object has only one strata, this parameter can be omitted.
event	If the model-object is a multistate-model, the number of the event-type needs to be specified.
col	Color of the confident interval area. Default is "grey". A transparent value is recommended, for example "adjustcolor("red",0.1).
invert	Inverts the area if TRUE, default is FALSE.

Value

Draws an area for the confidence interval.

Examples

  require(survival)
  aml_model <- with(aml, survfit(Surv(time, status)~x))
  col1 <- adjustcolor("red",0.2); col2 <- adjustcolor("blue",0.2)
  survPlot(xmax=50, space.nrAtRisk=0.32)
  confIntArea(aml_model, col=col1, group=1)
  confIntArea(aml_model, col=col2, group=2)
  survCurve(aml_model, group=1)
  survCurve(aml_model, group=2, lty=2)
  nrAtRisk(aml_model, group=1, y=-0.17, bgcol.flag=col1, label="maintain")
  nrAtRisk(aml_model, group=2, y=-0.24, bgcol.flag=col2, lty.flag=2, label="non-maint.")

Example output

Loading required package: survival

survCurve documentation built on April 14, 2020, 5:12 p.m.