R/plotBrier.R

Defines functions plotBrier

Documented in plotBrier

### plotBrier.R --- 
#----------------------------------------------------------------------
## author: Thomas Alexander Gerds
## created: Feb 23 2017 (11:07) 
## Version: 
## last-updated: Dec  6 2019 (11:18) 
##           By: Thomas Alexander Gerds
##     Update #: 73
#----------------------------------------------------------------------
## 
### Commentary: 
## 
### Change Log:
#----------------------------------------------------------------------
## 
### Code:
##' Plot Brier score curves
##' @title Plot Brier curve
#' @param x Object obtained with \code{Score}
#' @param models Choice of models to plot
#' @param which Character. Either \code{"score"} to show AUC or
#'     \code{"contrasts"} to show differences between AUC.
#' @param xlim Limits for x-axis
#' @param ylim Limits for y-axis
#' @param xlab Label for x-axis
#' @param ylab Label for y-axis
#' @param col line color
#' @param lwd line width
#' @param lty line style
#' @param cex point size
#' @param pch point style
#' @param type line type
#' @param axes Logical. If \code{TRUE} draw axes.
#' @param percent Logical. If \code{TRUE} scale y-axis in percent.
#' @param conf.int Logical. If \code{TRUE} draw confidence shadows.
#' @param legend Logical. If \code{TRUE} draw legend.
#' @param ... Used for additional control of the subroutines: plot,
#'     axis, lines, legend. See \code{\link{SmartControl}}.
##' @examples
##' # survival
##' library(survival)
##' library(prodlim)
##' ds1=sampleData(40,outcome="survival")
##' ds2=sampleData(40,outcome="survival")
##' f1 <- coxph(Surv(time,event)~X1+X3+X5+X7+X9,data=ds1,x=TRUE)
##' f2 <- coxph(Surv(time,event)~X2+X4+X6+X8+X10,data=ds1,x=TRUE)
##' xscore <- Score(list(f1,f2),formula=Hist(time,event)~1,data=ds2,times=0:12,metrics="brier")
##' plotBrier(xscore)
#' @export
#'
#' 
plotBrier <- function(x,
                      models,
                      which="score",
                      xlim,
                      ylim,
                      xlab,
                      ylab,
                      col,
                      lwd,
                      lty=1,
                      cex=1,
                      pch=1,
                      type="l",
                      axes=1L,
                      percent=1L,
                      conf.int=0L,
                      legend=1L,
                      ...){
    times=contrast=model=se=Brier=lower=upper=delta.Brier=reference=NULL
    ## cbPalette <- c("#999999", "#E69F00", "#56B4E9", "#009E73", "#F0E442", "#0072B2", "#D55E00", "#CC79A7")
    cbbPalette <- c("#000000", "#E69F00", "#56B4E9", "#009E73", "#F0E442", "#0072B2", "#D55E00", "#CC79A7")
    which <- tolower(which[1])
    pframe <- switch(which,
                     "score"={copy(x$Brier$score)},
                     "ipa"={copy(x$Brier$score)},
                     "contrasts"={copy(x$Brier$contrasts)},
                     {stop("argument 'which' has to be either 'score' for Brier, 'ipa' for IPA, or 'contrasts' for differences in Brier.")})
    if (length(pframe$times)<2) stop(paste("Need at least two time points for plotting time-dependent Brier. Object has only ",length(pframe$times),"times"))
    if (!missing(models)) pframe <- pframe[model %in% models]
    if (which=="score"){
        mm <- unique(pframe$model)
        if ("se"%in%names(pframe)){
            pframe[is.na(se)&times==0,lower:=0]
            pframe[is.na(se)&times==0,upper:=0]
        }
    }else{
        if (which =="ipa"){
            mm <- unique(pframe[model!="Null model",model[1]])
            pframe <- pframe[model%in%mm]
            if ("se"%in%names(pframe)){
                pframe[is.na(se)&times==0,lower:=0]
                pframe[is.na(se)&times==0,upper:=0]
            }
        }else{
            pframe[,contrast:=factor(paste(model,reference,sep=" - "))]
            mm <- unique(pframe$contrast)
            if ("se"%in%names(pframe)){
                pframe[is.na(se)&times==0,lower:=0]
                pframe[is.na(se)&times==0,upper:=0]
            }
        }
    }
    lenmm <- length(mm)
    if(missing(xlab)) xlab <- "Time"
    if(missing(ylab)) ylab <- switch(which,
                                     "score"="Brier score",
                                     "ipa"="Index of prediction accuracy",
                                     expression(paste(Delta, " Brier score")))
    if(missing(col)) col <- rep(cbbPalette,length.out=lenmm)
    names(col) <- mm
    if(missing(lwd)) lwd <- 2
    lwd <- rep(lwd,length.out=lenmm)
    names(lwd) <- mm
    pch <- rep(pch,length.out=lenmm)
    names(pch) <- mm
    type <- rep(type,length.out=lenmm)
    names(type) <- mm
    if(missing(lwd)) lty <- 1
    lty <- rep(lty,length.out=lenmm)
    names(lty) <- mm
    if (missing(xlim)) xlim <- pframe[,range(times)]
    if (missing(ylim)){
        if (which%in%c("score","ipa")) {
            ylim <- c(0,.3)
            if (which=="ipa"){
                ylim <- c(0,max(pframe$IPA,na.rm=0))
            }
            axis2.DefaultArgs <- list(side=2,
                                      las=2,
                                      at=seq(0,ylim[2],ylim[2]/4),
                                      mgp=c(4,1,0))
        } else{
            ylim <- c(floor(10*min(pframe$lower))/10,ceiling(10*max(pframe$upper))/10)
            yat <- seq(ylim[1],ylim[2],0.05)
            ## this is a strange behaviour of R: seq(-0.6,.1,0.05)
            ## [1] -6.000000e-01 -5.500000e-01 -5.000000e-01 -4.500000e-01 -4.000000e-01 -3.500000e-01 -3.000000e-01 -2.500000e-01
            ## [9] -2.000000e-01 -1.500000e-01 -1.000000e-01 -5.000000e-02  1.110223e-16  5.000000e-02  1.000000e-01
            yat <- round(100*yat)/100
            ## axis2.DefaultArgs <- list(side=2,las=2,at=seq(ylim[1],ylim[2],abs(ylim[2]-ylim[1])/4),mgp=c(4,1,0))
            axis2.DefaultArgs <- list(side=2,las=2,at=yat,mgp=c(4,1,0))
        }
    }else{
        axis2.DefaultArgs <- list(side=2,las=2,at=seq(ylim[1],ylim[2],abs(ylim[2]-ylim[1])/4),mgp=c(4,1,0))
    }
    lines.DefaultArgs <- list(pch=pch,type=type,cex=cex,lwd=lwd,col=col,lty=lty)
    axis1.DefaultArgs <- list(side=1,las=1,at=seq(0,xlim[2],xlim[2]/4))
    if (which%in%c("score","ipa")){
        legend.DefaultArgs <- list(legend=mm,lwd=lwd,col=col,lty=lty,cex=cex,bty="n",y.intersp=1.3,x="topleft")
        if (which=="ipa") legend.DefaultArgs$x="bottomleft"
    } else{
        legend.DefaultArgs <- list(legend=as.character(unique(pframe$contrast)),lwd=lwd,col=col,lty=lty,cex=cex,bty="n",y.intersp=1.3,x="topleft")
    }
    plot.DefaultArgs <- list(x=0,y=0,type = "n",ylim = ylim,xlim = xlim,ylab=ylab,xlab=xlab)
    control <- prodlim::SmartControl(call= list(...),
                                     keys=c("plot","lines","legend","axis1","axis2"),
                                     ignore=NULL,
                                     ignore.case=TRUE,
                                     defaults=list("plot"=plot.DefaultArgs,
                                                   "lines"=lines.DefaultArgs,
                                                   "legend"=legend.DefaultArgs,
                                                   "axis1"=axis1.DefaultArgs,
                                                   "axis2"=axis2.DefaultArgs),
                                     forced=list("plot"=list(axes=FALSE),
                                                 "axis1"=list(side=1)),
                                     verbose=TRUE)
                                     
                                     if (which%in%c("score","ipa")){
                                         ## Brier
                                         do.call("plot",control$plot)
                                         pframe[,{thisline <- control$line
                                             thisline$col=thisline$col[[as.character(model[1])]]
                                             thisline$lwd=thisline$lwd[[as.character(model[1])]]
                                             thisline$lty=thisline$lty[[as.character(model[1])]]
                                             thisline$pch=thisline$pch[[as.character(model[1])]]
                                             thisline$type=thisline$type[[as.character(model[1])]]
                                             thisline$x=times
                                             if (which =="ipa"){
                                                 thisline$y=IPA
                                             }else{
                                                 thisline$y=Brier
                                             }
                                             do.call("lines",thisline)},by=model]
                                     }else{
                                         ## delta Brier
                                         do.call("plot",control$plot)
                                         pframe[,{thisline <- control$line;
                                             thisline$col=thisline$col[[as.character(contrast[1])]];
                                             thisline$lwd=thisline$lwd[[as.character(contrast[1])]];
                                             thisline$lty=thisline$lty[[as.character(contrast[1])]];
                                             thisline$pch=thisline$pch[[as.character(contrast[1])]];
                                             thisline$type=thisline$type[[as.character(contrast[1])]];
                                             thisline$x=times;
                                             thisline$y=delta.Brier;
                                             do.call("lines",thisline)},by=contrast]
                                     }
                                     ## legend
                                     if (!(is.logical(legend[[1]]) && legend[[1]]==FALSE)){
                                         do.call("legend",control$legend)
                                     }
                                     ## x-axis
                                     if (conf.int==TRUE){
                                         dimcol <- sapply(col,function(cc){prodlim::dimColor(cc)})
                                         names(dimcol) <- names(col)
                                         if (which=="score"){
                                             pframe[,polygon(x=c(times,rev(times)),y=c(lower,rev(upper)),col=dimcol[[as.character(model)]],border=NA),by=model]
                                         }else{
                                             pframe[,polygon(x=c(times,rev(times)),y=c(lower,rev(upper)),col=dimcol[[as.character(contrast)]],border=NA),by=contrast]
                                         }
                                     }
                                     if (axes){
                                         control$axis2$labels <- paste(100*control$axis2$at,"%")
                                         do.call("axis",control$axis1)
                                         do.call("axis",control$axis2)
                                     }
                                     invisible(pframe)
    }


#----------------------------------------------------------------------
### plotBrier.R ends here

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riskRegression documentation built on Jan. 13, 2021, 11:12 a.m.