在R中的roc图上按组添加AUC

Question

I have roc plots for 4 groups, I want to add auc values for each group in the legend:

## draw plots
basicplot <- ggplot(roc_long, aes(d = outcome, m = prediction, color = model)) + geom_roc(n.cuts = 0) + 
+   style_roc(theme = theme_bw, xlab = "1-Specificity", ylab = "Sensitivity") 
## calculate auc
calc_auc(basicplot)
      PANEL group       AUC
    1     1     1 0.7718926
    2     1     2 0.9296029
    3     1     3 0.7790979
    4     1     4 0.8235286

annotate <- basicplot + 
     ggtitle("ROC plots for 4 outcomes") +
     theme(plot.title = element_text(hjust = 0.5)) +
     annotate("text", x = .75, y = .25, label = paste("AUC =", round(calc_auc(basicplot)["AUC"], 3)))

     annotate

My plots looks like this: How can I add AUC to each group on the right?

Thanks!

Answer 1

您可以使用round(calc_auc(basicplot)[["AUC"]][1/2/3/4]提取calc_auc（basicplot）中的特定单元格，并将它们换成新句子。此外，您可能需要\\n打破几条新线的长句。