FTB-C000619 / Implementation concept

Density Reachability Chain

Density Reachability Chain is the chain of overlapping neighborhoods that connects points into one DBSCAN cluster.

Advanced 1 linked topicEvidence-reviewed

Definitions

In plain terms

A cluster can span farther than one epsilon because intermediate points bridge it.

Technical

Density reachability is transitive through core neighborhoods; total cluster width is not capped at epsilon.

Scope

Interpreting epsilon as a hard cluster-width limit is a common DBSCAN error.

Examples

  • A reviewer computes Density Reachability Chain on a small deterministic fixture and checks timing, units, and boundary behavior before publication.

Common misconceptions

  • Interpreting epsilon as a hard cluster-width limit is a common DBSCAN error.

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-A03 Important

Evidence and governance

  1. A Density-Based Algorithm for Discovering Clusters in Large Spatial Databases with Noise Ester, Kriegel, Sander, Xu · first party technical publication

    Supports: preferred label, short definition, technical definition

    Limits: The original paper is not about financial support or resistance; that application is a package design.

  2. sklearn.cluster.DBSCAN scikit-learn · first party technical publication

    Supports: preferred label, short definition, technical definition

    Limits: The package implements deterministic one-dimensional DBSCAN directly for Python/TypeScript parity.

  3. Pine Script pivot techniques TradingView · official platform documentation

    Supports: preferred label, short definition, technical definition

    Limits: The package freezes its own equality, separation, and OHLC policies rather than claiming one universal pivot definition.

  4. numpy.log NumPy · first party technical publication

    Supports: preferred label, short definition, technical definition

    Limits: A log transform requires positive finite prices and does not by itself define a financial level.

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.