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rmachine-learningartificial-intelligenceclassification

Multiclass ROC curves in R

I'm new to the concept of ROC curves. I've tried to understand it by reading a few tutorials on the web. I found a really good example here in python which was helpful.

I want to plot a ROC curve for multiclass classifier that I built(in Python). However, Most of the solutions on the web are for 2 class problems and not multiclass.

However, I finally found "multiclass.roc" function in pROC package in R which does multiclass ROC curve plotting.

The following is a simple example:

library(pROC)
data(aSAH)
multiclass.roc(aSAH$gos6, aSAH$s100b)

However, I don't understand how to interpret it (as I don't know R).

Can anyone please point out what aSAH$s100b variable refers to? I can say aSAH$gos6 points to different classes of data in aSAH dataset.

Solution

  • Additionally, you might want to look at Fawcett, 2006 for a very nice guide to understanding and implementing ROC plots. He also addresses multi-class ROC and AUC, as well as points to additional resources.