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Thresholds, ROC, and What Accuracy Hides

A single error rate conceals which errors are being made and silently fixes a threshold nobody chose. The confusion matrix separates the two kinds, moving the threshold trades them, and the ROC curve summarises every trade at once.

IntermediateModule 330 min · 120 XP
A confusion matrix splitting one error rate into two kinds, a threshold sliding along the score axis while the four cells rebalance, and the resulting pairs tracing out the ROC curve with its area filling in.

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