FTB-C000605 / Implementation concept

Strict Extreme Update

Strict Extreme Update is the policy that updates a provisional extreme only when a new close is strictly farther in the active direction.

Advanced 1 linked topicEvidence-reviewed

Definitions

In plain terms

An equal high or low keeps the earlier endpoint under this convention.

Technical

Up-leg updates require P_t > P_h and down-leg updates require P_t < P_l; equality preserves the existing event index.

Scope

An equality policy changes repaint behavior and event ownership.

Examples

  • A reviewer computes Strict Extreme Update on a small deterministic fixture and checks timing, units, and boundary behavior before publication.

Common misconceptions

  • An equality policy changes repaint behavior and event ownership.

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.

  • D08-F01-A02 Important

Evidence and governance

  1. LEAN ZigZag source QuantConnect · first party technical publication

    Supports: preferred label, short definition, technical definition, variant distinction

    Limits: A maintained implementation is evidence for one convention, not a universal market rule.

  2. Pine Script repainting concepts TradingView · official platform documentation

    Supports: preferred label, short definition, technical definition, variant distinction

    Limits: Platform display behavior does not establish financial usefulness or predictive value.

  3. Closing Price Investor.gov · official standard

    Supports: preferred label, short definition, technical definition, variant distinction

    Limits: A close is not automatically an adjusted close and may vary by market session convention.

Reviewed by
fintech-builder-batch-011
Last reviewed
2026-08-09
Next review
2027-08-09
Record status
evidence reviewed

This record is evidence-reviewed and readable, but not yet promoted to published — it is served noindex,follow and excluded from the sitemap.

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.