Each instance in the ROC curve has a threshold value of class. If the instance highly belongs to this class, its threshold will be close to 1 so it will have red colour, the higher threshold of instance the dark colour it will have in the ROC curve.

Regards,
Martin

On 15 November 2015 at 20:27, manushimn <manushimn@gmail.com> wrote:
As I know different points in curve are pairs of (false positive rate, true
positive rate)for different threshhold values. Is not it? so y color code
this curve according to a class code? what does that mean?



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