FTB-C000516 / Implementation concept

BandWidth Positive-Middle Requirement

BandWidth Positive-Middle Requirement withholds relative width unless the Bollinger middle band is strictly positive.

Also known aspositive BBW denominator

Intermediate 1 linked topicPublished

Definitions

In plain terms

The rule keeps the percent interpretation meaningful and prevents division by zero.

Technical

The D07 contract returns unavailable for a zero or negative middle even if the upper and lower bands themselves are numerically defined.

Scope

Other domains may adopt a different denominator policy, but it must be named rather than silently assumed.

Examples

  • A reviewer traces BandWidth Positive-Middle Requirement from aligned inputs through its first-ready row and edge cases before accepting a displayed value.

Common misconceptions

  • Other domains may adopt a different denominator policy, but it must be named rather than silently assumed.

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.

  • D07-F04-A06 Important

Evidence and governance

  1. Bollinger BandWidth TradingView · official platform documentation

    Supports: preferred label, short definition, technical definition

    Limits: No universal squeeze threshold, breakout direction, causal forecast, or profitability claim is adopted.

Reviewed by
fintech-builder-batch-009
Last reviewed
2026-07-30
Next review
2027-07-30
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.