# #aggregation

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Page: https://videotomd.com/t/aggregation/
Briefs: 7

- [Suppress Thin-Sample Local Sale Medians](https://videotomd.com/b/text-local-suppress-thin-sample-local-medians-4864f1f9b9ba/index.md): Calculate local housing-price medians with a labeled county fallback for groups containing fewer than 20 sales.
- [Separate Trial Facts From Batch Analysis](https://videotomd.com/b/text-local-separate-trial-facts-from-batch-analysis-f9a2f8ffda46/index.md): Aggregate normalized facts automatically and configure semantic analysis separately.
- [Keep capped histories from producing false totals](https://videotomd.com/b/text-local-separate-history-cycles-and-truncation-013a01ef9967/index.md): Expose truncation and withhold totals across unrelated record cycles.
- [Scope Reconciliation Checks by Grain and Window](https://videotomd.com/b/text-local-scope-reconciliation-checks-by-grain-77cd0b234631/index.md): Validate signed summary totals only within matching scope; keep that check separate from detail-row verification.
- [Carry geographic grain with computed values](https://videotomd.com/b/text-local-keep-derived-values-with-their-grain-013a01ef9967/index.md): Compute wider statistics from underlying records and keep their scope attached.
- [Exclude Rollups from Local Aggregates](https://videotomd.com/b/text-local-guard-mixed-grain-rollups-4b39c211bf17/index.md): Prevent regional and intermediate totals from entering local selections or sums.
- [Require complete coverage before reporting zero](https://videotomd.com/b/text-local-gate-zero-values-on-pull-coverage-ef5723f26b63/index.md): Preserve held data during outages and prevent missing collection windows from becoming invented zeros.