FTB-C000236 / Algorithm

Threshold Crossing

Threshold Crossing occurs when a measured series moves across a declared level under an explicit comparison rule.

Also known aslevel crossing

Intermediate 2 linked topicsPublished

Definitions

In plain terms

It distinguishes a new crossing event from merely remaining above or below a level.

Technical

Detection specifies direction, strict or inclusive comparisons, prior valid observation, missing values, persistence, and timestamp.

Scope

Touching a threshold is not always a crossing; the comparison convention decides.

Examples

  • A Fintech Builder lesson can compute or identify Threshold Crossing only after declaring its inputs, timing, and edge-case rules.

Common misconceptions

  • Touching a threshold is not always a crossing; the comparison convention decides.

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.

  • D04-F03-A03 Important

Evidence and governance

  1. Advance-Decline Ratio Indicators and the Zweig Breadth Thrust StockCharts · secondary methodology

    Supports: preferred label, short definition, technical definition

    Limits: Historical signal descriptions are not evidence of future performance, and implementations must freeze thresholds and window semantics.

Reviewed by
fintech-builder-batch-005
Last reviewed
2026-07-27
Next review
2027-07-27
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.