Definitions
In plain terms
It combines issue participation and trading volume in a ratio of ratios commonly called TRIN.
Technical
Compute (A/D)/(UV/DV) from aligned counts and volumes, with explicit policies for zero denominators, universe, session, and feed revisions.
Scope
Its direction can feel inverted; a larger value does not simply mean more advancing participation.
Formula
TRIN = (A / D) / (UV / DV)TRIN=\frac{A/D}{UV/DV}| Symbol | Meaning | Unit |
|---|---|---|
A | advancing issues | issues |
D | declining issues | issues |
UV | up volume | shares or contracts |
DV | down volume | shares or contracts |
Output unit: ratio
Examples
- A Fintech Builder lesson can compute or identify Arms Index only after declaring its inputs, timing, and edge-case rules.
Common misconceptions
- Its direction can feel inverted; a larger value does not simply mean more advancing participation.
Concept relationships
Where this concept is used
Evidence and governance
- Arms Index (TRIN) StockCharts ChartSchool · secondary methodology
Supports: preferred label, short definition, technical definition, formula
Limits: Interpretive levels are market- and period-dependent; zero denominators and feed coverage require explicit policy.
- Reviewed by
- fintech-builder-batch-005
- 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.