Definitions
In plain terms
With multiplier k, each Bollinger band is k standard deviations from the middle and the full width is two k standard deviations.
Technical
The multiplier is dimensionless, nonnegative in the local contract, and must be stored with the lookback and deviation convention.
Scope
The common value two is a default, not a universal statistical or trading threshold.
Examples
- A reviewer traces Symmetric Deviation Multiplier from aligned inputs through its first-ready row and edge cases before accepting a displayed value.
Common misconceptions
- The common value two is a default, not a universal statistical or trading threshold.
Concept relationships
Where this concept is used
Evidence and governance
- Bollinger Bands Rules John Bollinger · first party methodology
Supports: preferred label, short definition, technical definition
Limits: Interpretive rules do not prove forecasting power, trade profitability, or one universal parameter selection.
- Bollinger Bands TradingView · official platform documentation
Supports: preferred label, short definition, technical definition
Limits: Platform behavior and interpretation are not universal standards and do not replace the local frozen variant.
- Reviewed by
- fintech-builder-batch-009
- Last reviewed
- 2026-07-30
- Next review
- 2027-07-30
- Record status
- published