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Train/Test Split with Stratification: A Field Guide When Class Balance Decides the Holdout
Stratified train/test splitting is the difference between a model that reports 92% accuracy and one…
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Dataset Imbalance: The Three Ratios Your Spreadsheet Liked Until Your Model Did Not
Three numbers to compute before training a classifier, five strategies that actually fix class imbalance, and the four cases when you should not resample at all.