FTB-C000511 / Implementation concept

Tied-Extreme Persistence

Tied-Extreme Persistence means a rolling boundary remains unchanged when one equal extreme expires but another equal owner remains.

Also known asduplicate-extreme persistence

Intermediate 1 linked topicPublished

Definitions

In plain terms

Two identical highest highs or lowest lows can extend the life of a Donchian boundary beyond the first owner's exit.

Technical

The state requires exact or contract-defined equality and changes only after the final tied owner leaves or a new more extreme value arrives.

Scope

Inspecting only the oldest owner can therefore predict the wrong boundary-change row.

Examples

  • A reviewer traces Tied-Extreme Persistence from aligned inputs through its first-ready row and edge cases before accepting a displayed value.

Common misconceptions

  • Inspecting only the oldest owner can therefore predict the wrong boundary-change row.

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

    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.