CCDV-F objective 5.3 · Domain 5 · 16.8% of the exam
Model Selection and Tradeoffs
Choosing a tier, and moving between them. Begin at the cheapest model that could plausibly clear the bar and let a measurement decide, rather than beginning at the strongest and asking an eval to justify stepping down. Aggregate accuracy is a weighted average whose weights are the test set's, so a slice where mistakes are expensive can lose while the total wins. Changing tier is a code change, since parameters are gated per model and a body valid on one is refused by another.
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The rest of domain 5: Model Selection and Optimization
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