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NR7 flag (narrowest range in 7 days)

What it is

NR7 flag (narrowest range in 7 days) — registry key screener_nr7.

Per-ticker NR7 pattern flag (0 or 1). An NR7 occurs when today’s high-low range is the narrowest of the last 7 days — a volatility-compression signal that often precedes an expansion. Stored in screener_features_daily. Feeds archetype scorers (A4 coiling).

Data-pyramid tier

T1 — Signal. This metric sits at the signal layer of the platform’s six-tier data pyramid (T0 raw inputs → T5 actionable read). The tier reflects how far the value is from a raw measurement — not how strongly it is validated. Abstraction and validation are separate axes: a higher tier is not a claim of stronger evidence.

Horizon & validation

No validated skill horizon is on file for this metric — read it as context / a data carrier, not a validated edge. Stamps are added only when a gated research verdict lands.

Source

Source module: screener
Data source: computed

Derived metric — produced inside the platform (app/sources/screener.py or equivalent) rather than fetched as a raw upstream value. See the How it's computed section below for the formula.

How it’s computed

1 if (today_high - today_low) < min(high - low for each of the prior 6 days), else 0. NULL when fewer than 7 rows or high/low data is missing.

Where it surfaces

• API field: screener.features.nr7 on GET /api/v1/signals/latest

Health-score / alignment role

Data carrier — no implication, no health-score contribution.

Persisted for downstream consumers (sparklines, base-rate matcher, calibration substrate) but does not classify into BULLISH / NEUTRAL / BEARISH and does not contribute to the 0-100 health score.

Release cadence

• Publishes: daily