FTB-C000504 / Formula component

Donchian Lower Channel

Donchian Lower Channel is the minimum low inside the active lookback window.

Also known asDonchian lowerrolling lowest low

Foundation Formula defined 1 linked topicPublished

Definitions

In plain terms

A new lower low reduces it immediately, while an old low can hold it until its final owner expires.

Technical

The D07 contract includes the current low and publishes only after n valid rows form a complete window.

Scope

The current-inclusive lower boundary cannot be strictly above the current low.

Formula

Donchian lower = minimum low in trailing n rows
LaTeX: L_t=\min_{i=t-n+1}^{t}L_i
SymbolMeaningUnit
L_ilow at row iprice units
nDonchian lookbackbars

Output unit: price units

Examples

  • A reviewer traces Donchian Lower Channel from aligned inputs through its first-ready row and edge cases before accepting a displayed value.

Common misconceptions

  • The current-inclusive lower boundary cannot be strictly above the current low.

Concept relationships

Prerequisites

Related

Required by

Where this concept is used

Tutorials planned

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

  • D07-F04-A05 Important

Evidence and governance

  1. Donchian Channels TradingView · official platform documentation

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

    Limits: Causal lagging, tie ownership, and exact breakout event rules are local implementation boundaries.

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.