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Evaluating Imbalanced Classification Models

Medium
Model EvaluationF1 ScorePrecisionRecall
Asked 1mo ago|
Ernst & Young
Ernst & Young
Asked 19 times

Problem

Scenario

You are reviewing a classifier on a dataset where the positive class is rare, and the team is worried that standard evaluation can give a misleading picture of performance. You need to explain how you would judge whether the model is actually useful when most examples belong to the negative class.

Question

How do you evaluate a model on imbalanced datasets?

Observed Metrics

Recall·0.68AUC-ROC·0.93Accuracy·99.1%F1 score·0.51Precision·0.41Class prevalence·0.8%
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