Definitions
In plain terms
There is no previous close at index zero, so implementations must choose and document how readiness begins.
Technical
TA-Lib leaves the first value unavailable; this project's D07-F04 contract publishes high minus low at index zero.
Scope
Neither policy may be mixed silently because it shifts downstream ATR seeds and first-ready indexes.
Examples
- A reviewer traces True Range First-Bar Policy from aligned inputs through its first-ready row and edge cases before accepting a displayed value.
Common misconceptions
- Neither policy may be mixed silently because it shifts downstream ATR seeds and first-ready indexes.
Concept relationships
Prerequisites
Related
Contrasts with
Where this concept is used
Evidence and governance
- True Range TA-Lib · first party technical publication
Supports: preferred label, short definition, technical definition
Limits: TA-Lib leaves the first row unavailable; the local D07 contract explicitly uses a high-low fallback.
- TA-Lib True Range Reference Implementation TA-Lib · first party technical publication
Supports: preferred label, short definition, technical definition
Limits: Library control flow does not prescribe the local diagnostic driver label or its author-defined tie priority.
- Reviewed by
- fintech-builder-batch-009
- Last reviewed
- 2026-07-30
- Next review
- 2027-07-30
- Record status
- published