Preview laboratory sketch / Computing
Learning systems and evaluation
Move a classification threshold and watch false positives and false negatives trade places. Then change class prevalence and observe why precision changes even when sensitivity and specificity stay fixed.
Threshold and Prevalence experiment
Move a classification threshold and watch false positives and false negatives trade places. Then change class prevalence and observe why precision changes even when sensitivity and specificity stay fixed.
What changed
Threshold 55% and prevalence 35% reshape the confusion matrix. Precision can change even when the detector itself does not.
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