pROC
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Plot multiclass.roc
This already kind of works with ggroc and univariate multiclass:
m <- multiclass.roc(aSAH$gos6, aSAH$s100b) ggroc(m$rocs)
This should be improved so that legend is shown correctly, and extended to multivariate plots with ggroc, as well as standard plots.
Note that multiclass.roc(..., plot = TRUE) is supported but not exactly useful. See https://stackoverflow.com/q/60839098/333599.