FTB-C000655 / Formula component

Double Bottom Neckline

Double Bottom Neckline is the horizontal level defined by the intervening peak in a double-bottom candidate.

Advanced Formula defined 1 linked topicEvidence-reviewed

Definitions

In plain terms

The neckline is the resistance boundary whose upside break confirms the candidate.

Technical

For the double-bottom variant, N_t equals the intervening peak price across the confirmation window.

Scope

A neckline crossing can confirm the detector without proving a sustained trend change.

Formula

N_t equals the intervening peak price
LaTeX: N_t=v
SymbolMeaningUnit
vintervening peakprice

Output unit: price

Examples

  • A reviewer computes Double Bottom Neckline on a deterministic close fixture and checks pivot timing, threshold equality, neckline behavior, and rejection diagnostics before publication.

Common misconceptions

  • A neckline crossing can confirm the detector without proving a sustained trend change.

Concept relationships

Prerequisites

Related

Required by

Where this concept is used

Evidence and governance

  1. Members' Guide to 2021 Refresher Readings CFA Institute · first party methodology

    Supports: preferred label, short definition, technical definition, formula

    Limits: The curriculum does not prescribe this package's pivot window, numeric thresholds, causal state machine, or performance claim.

  2. Foundations of Technical Analysis: Computational Algorithms, Statistical Inference, and Empirical Implementation Lo, Mamaysky, and Wang · first party technical publication

    Supports: preferred label, short definition, technical definition, formula

    Limits: The paper's smoothing, sample, and empirical design are not copied into this package and do not validate its thresholds.

  3. Pine Script repainting concepts TradingView · official platform documentation

    Supports: preferred label, short definition, technical definition, formula

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

  4. scipy.signal.find_peaks SciPy · first party technical publication

    Supports: preferred label, short definition, technical definition, formula

    Limits: This retrospective signal function is not itself a causal OHLC pivot detector.

  5. Pine Script pivot techniques TradingView · official platform documentation

    Supports: preferred label, short definition, technical definition, formula

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

  6. Zig Zag indicator QuantConnect · official platform documentation

    Supports: preferred label, short definition, technical definition, formula

    Limits: This package selects a close-only percentage-reversal variant and documents the difference.

  7. LEAN ZigZag source QuantConnect · first party technical publication

    Supports: preferred label, short definition, technical definition, formula

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

Reviewed by
fintech-builder-batch-012
Last reviewed
2026-08-10
Next review
2027-08-10
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.