chapter 41
metrics, slices, and error analysis
accuracy is a blunt instrument. learn confusion matrices, precision, recall, thresholds, slices, and failure notes so model quality has evidence.
metrics, slices, and error analysis
Model quality is not a single number. This chapter turns confusion matrices, precision, recall, thresholds, slices, residuals, and triage notes into evidence a teammate can inspect.
The exercises use small Python dictionaries and lists so every check can run in the browser. Real-world tools may be larger, but the review shape stays the same: input, decision, evidence, blocker, and next step.
By the end of the chapter, learners should be able to turn this topic into a concrete handoff instead of a vague model claim.
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lessons in this chapter
- the confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth fasterthe confusion matrix tells the truth faster
- precision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffsprecision, recall, and threshold tradeoffs
- slice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysisslice-based error analysis
- regression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residualsregression metrics and residuals
- mission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triagemission: confusion matrix triage