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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.

5 live lessons · 35 live steps · 130 XP

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

  1. 01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps01the confusion matrix tells the truth faster7 steps
  2. 02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps02precision, recall, and threshold tradeoffs7 steps
  3. 03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps03slice-based error analysis7 steps
  4. 04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps04regression metrics and residuals7 steps
  5. 05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps05mission: confusion matrix triage7 steps