Linked Questions

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2answers
736 views

ROC accuracy measure error when no positive values

I have an unbalanced dataset that I am working to either up or down sample to balance out. But in the meantime I've run into an interesting error when calculating the AUC in R using ...
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1answer
743 views

ROC AUC and PR AUC: Are the AUC values different for each class?

When dealing with a binary classification problem, where the decision function threshold is being varied from 0 to 1 at step 0.1: When calculating the Area Under the Curve (AUC) for a ROC Curve plot (...
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1answer
36 views

ROC Curve Horizontal Line

I'm trying to conceptually understand 'why' the horizontal gray line in ROC curve below would be considered random. I know the basics of the ROC in that the farther the curved black line is from the ...
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0answers
55 views

How to interpret ROC curve? [duplicate]

I am currently doing a classification problem for classifying the functional class and non-functional class of peptidase cleavage site. The data on non-functional class (negative class) is highly ...
0
votes
1answer
153 views

Logistic-regression probability score used for reordering rows for plotting ROC curve: is it the actual, positive, or negative class probability?

I want to draw my own ROC curve, such as explained in the accepted answer to this question: Understanding ROC curve However, it isn't clearly explained what the 'score' used represents. It is used ...
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0answers
83 views

How can I plot a ROC from this table? [duplicate]

I'm given a table Class | Probability P .95 N .85 P .78 and so on. I'm asked to construct a ROC. As I understand, a ROC has TP for the ...

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