riskRegression (version 2022.03.22)

plotROC: Plot ROC curves

Description

Plot ROC curve

Usage

plotROC(
  x,
  models,
  times,
  xlab = "1-Specificity",
  ylab = "Sensitivity",
  col,
  lwd,
  lty = 1,
  cex = 1,
  pch = 1,
  legend = TRUE,
  auc.in.legend = TRUE,
  brier.in.legend = FALSE,
  add = FALSE,
  ...
)

Arguments

x

Object obtained with function Score

models

Choice of models to plot

times

Time point(s) specifying the prediction horizon

xlab

Label for x-axis

ylab

Label for y-axis

col

line color

lwd

line width

lty

line style

cex

point size

pch

point style

legend

logical. If 1L draw a legend with the values of AUC.

auc.in.legend

Logical. If TRUE add AUC to legend.

brier.in.legend

Logical. If TRUE add Brier score to legend.

add

logical. If 1L add lines to an existing plot.

...

Used for additional control of the subroutines: plot, axis, lines, legend, addtable2plot. See SmartControl.

Examples

## binary
set.seed(18)
if (require("randomForest",quietly=TRUE)){
library(randomForest)
library(prodlim)
bdl <- sampleData(40,outcome="binary")
bdt <- sampleData(58,outcome="binary")
bdl[,y:=factor(Y)]
bdt[,y:=factor(Y)]
fb1 <- glm(y~X1+X2+X3+X4+X5+X6+X7+X8+X9+X10,data=bdl,family="binomial")
fb2 <- randomForest(y~X1+X2+X3+X4+X5+X6+X7+X8+X9+X10,data=bdl)
xb <- Score(list("glm"=fb1,"rf"=fb2),y~1,data=bdt,
            plots="roc",metrics=c("auc","brier"))
plotROC(xb,brier.in.legend=1L)

# with cross-validation
if (FALSE) {
xb3 <- Score(list("glm"=fb1,"rf"=fb2),y~1,data=bdl,
            plots="roc",B=3,split.method="bootcv",
            metrics=c("auc"))
}
}
## survival
set.seed(18)
library(survival)
sdl <- sampleData(40,outcome="survival")
sdt <- sampleData(58,outcome="survival")
fs1 <- coxph(Surv(time,event)~X3+X5+X6+X7+X8+X10,data=sdl,x=TRUE)
fs2 <- coxph(Surv(time,event)~X1+X2+X9,data=sdl,x=TRUE)
xs <- Score(list(model1=fs1,model2=fs2),Hist(time,event)~1,data=sdt,
            times=5,plots="roc",metrics="auc")
plotROC(xs)
## competing risks
data(Melanoma)
f1 <- CSC(Hist(time,status)~age+sex+epicel+ulcer,data=Melanoma)
f2 <- CSC(Hist(time,status)~age+sex+logthick+epicel+ulcer,data=Melanoma)
x <- Score(list(model1=f1,model2=f2),Hist(time,status)~1,data=Melanoma,
            cause=1,times=5*365.25,plots="roc",metrics="auc")
plotROC(x)