FTB-C000228 / Indicator

High-Low Index

High-Low Index is new highs as a percentage of the combined new-high and new-low count.

Also known asnew-high percentage

Intermediate Formula defined 1 linked topicPublished

Definitions

In plain terms

It places high-low breadth on a zero-to-100 scale when at least one eligible issue made an extreme.

Technical

Compute 100*NH/(NH+NL) and declare the result missing when the denominator is zero unless another policy is explicitly governed.

Scope

It is not the NH/NL High-Low Ratio.

Formula

High-low index = 100 * NH / (NH + NL)
LaTeX: HLI=100\frac{NH}{NH+NL}
SymbolMeaningUnit
NHnew-high issuesissues
NLnew-low issuesissues

Output unit: percent

Examples

  • A Fintech Builder lesson can compute or identify High-Low Index only after declaring its inputs, timing, and edge-case rules.

Common misconceptions

  • It is not the NH/NL High-Low Ratio.

Concept relationships

Prerequisites

Related

Where this concept is used

Tutorials planned

These catalogued topics use this concept, but their complete build has not shipped yet.

  • D04-F03-A03 Primary

Evidence and governance

  1. High-Low Index StockCharts ChartSchool · secondary methodology

    Supports: preferred label, short definition, technical definition, formula

    Limits: Examples are educational and provider-specific; they do not prescribe a universal universe, lookback, or trading rule.

Reviewed by
fintech-builder-batch-005
Last reviewed
2026-07-27
Next review
2027-07-27
Record status
published
Written by

Fintech engineer building market-data and financial systems, and the author of every article, glossary record, and reference implementation on The Fintech Builder.