Weird (for me at least) ROC curve

SguishSguish Member Posts: 13 Contributor II
edited November 2018 in Help
Hello!
I'm working on a decision tree and, performance-wise, it works great - accuracy is 99.59%.
In the performance module I selected also AUC (neutral), to check the ROC curve, and here it is:

image

Now, question is: being accuracy 99.59%, I understand the red curve - almost a perfect fit. But what about the blue one? Is it like the straight diagonal line for the ROC used for regression?
Thank you!

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