Tidiers for objects from the AUC package

Description

Tidy "roc" objects from the "auc" package. This can be used to, for example, draw ROC curves in ggplot2.

Usage

## S3 method for class 'roc'
tidy(x, ...)

Arguments

Value

A data frame with three columns:

If the labels had names, those are added as an "instance" column.

Examples

if (require("AUC", quietly = TRUE)) {
  data(churn)
  r <- roc(churn$predictions,churn$labels)
  
  td <- tidy(r)
  head(td)
  
  library(ggplot2)
  ggplot(td, aes(fpr, tpr)) +
    geom_line()
    
  # compare the ROC curves for two prediction algorithms
  library(dplyr)
  library(tidyr)
  
  rocs <- churn %>%
    tidyr::gather(algorithm, value, -labels) %>%
    group_by(algorithm) %>%
    do(tidy(roc(.$value, .$labels)))
  
  ggplot(rocs, aes(fpr, tpr, color = algorithm)) +
    geom_line()
}

Results