Definitions
In plain terms
It creates the first published ADX state after the directional-movement and DX stages are already ready.
Technical
The seed contract fixes exactly which DX values enter, indexing, required count, missing values, and precision.
Scope
The first ADX does not occur at the same row as the first one-bar true range.
Formula
Initial ADX = mean(first n valid DX values)ADX_{seed}=\frac{1}{n}\sum_{j=1}^{n}DX_j| Symbol | Meaning | Unit |
|---|---|---|
DX_j | valid directional-index value j | percent |
n | ADX period | observations |
Output unit: percent
Examples
- A governed lesson calculates or identifies Initial ADX only after its parameters, state, timing, and edge cases are declared.
Common misconceptions
- The first ADX does not occur at the same row as the first one-bar true range.
Concept relationships
Prerequisites
Required by
Where this concept is used
Evidence and governance
- TA-Lib Average Directional Index Implementation TA-Lib · first party technical publication
Supports: preferred label, short definition, technical definition, formula
Limits: Unstable periods and platform-specific first-ready indexes must be reconciled before claiming exact parity.
- Reviewed by
- fintech-builder-batch-007
- Last reviewed
- 2026-07-27
- Next review
- 2027-07-27
- Record status
- evidence reviewed
This record is evidence-reviewed and readable, but not yet promoted to published — it is served noindex,follow and excluded from the sitemap.