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

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.