1.2Standard
Rare classes and regions must appear in evaluation.
Preserve representation.
Choose two practices.
× Incorrect
Define important strata and check distribution and counts in each split while also protecting group and time boundaries.
Detailed explanation
CorrectCheck duplicates, groups, and time boundaries before splitting
Independence is preserved.
CorrectDefine class, region, or time strata and check distributions and counts in each split
Rare strata are retained.
IncorrectStratification permits one user across every split
Group leakage is separate.
IncorrectA different production distribution is acceptable if counts match
Representativeness is lost.
Check official documentation
Compare the following points with the official documentation.
AWS公式AIF-C01 Domain 1.2のサンプリング、データ分割、代表性を確認する。
Official references
What to confirm
少数層を保ちながら、重複・時系列・本番分布を考慮して分割できる。
Key points
- Stratification
- Representativeness
- Group leakage
Notes
- Environment: AWS公式AIF-C01試験ガイドとAWS公式ドキュメントの確認
- Compare the definition with the AIF-C01 objective and the service documentation before applying it.
- Keep the concept separate from a particular answer choice or implementation step.
Foundation review
Stratified sampling
Selecting records within defined subgroups to preserve important proportions.
Representativeness
How well a sample reflects the population and conditions of intended use.
Question IDAWS-AIF-473
EnvironmentAWS公式AIF-C01試験ガイドとAWS公式ドキュメントの確認
Last technical review2026-08-20
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