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A Review of the Receiver Operating Characteristic Curve and a Proof About the Area Beneath It

Summary

This paper reviews the Receiver Operating Characteristic (ROC) curve for binary classifiers, formally proves that the area under the curve (AUC) equals the probability that a classifier ranks a random positive instance higher than a random negative one, and provides an error bound when the required hypothesis is not met.

SourcearXiv Machine LearningAuthor: Steven Redolfi
A Review of the Receiver Operating Characteristic Curve and a Proof About the Area Beneath It
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[2605.00926] A Review of the Receiver Operating Characteristic Curve and a Proof About the Area Beneath It

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Computer Science > Machine Learning

arXiv:2605.00926 (cs)

[Submitted on 30 Apr 2026]

Title:A Review of the Receiver Operating Characteristic Curve and a Proof About the Area Beneath It

Authors:Steven Redolfi

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Abstract:The Receiver Operating Characteristic (ROC) curve of a binary classifier has often been utilized to measure the performance of the classifier. The area beneath this curve is used in particular because of its quoted probabilistic interpretation as being equal to the probability that the classifier will rank a random positive observation above a random negative observation. This paper formalizes this claim, produces a bound on how far away from the truth it is if a hypothesis is not met, and gives a small literature review of the ROC curve.

Subjects:

Machine Learning (cs.LG); Probability (math.PR)

Cite as: arXiv:2605.00926 [cs.LG]

(or arXiv:2605.00926v1 [cs.LG] for this version)

https://doi.org/10.48550/arXiv.2605.00926

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arXiv-issued DOI via DataCite

Submission history

From: Steven Redolfi [view email] [v1] Thu, 30 Apr 2026 18:55:43 UTC (8 KB)

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Key points

  • ROC curves are widely used to evaluate binary classifiers.
  • AUC is often interpreted as the probability that a classifier ranks a random positive above a random negative.
  • This paper formalizes that interpretation and derives a bound on the error when assumptions are violated.
  • Includes a literature review of the ROC curve.

Highlights and analysis are generated automatically and may contain errors. Check the original source.