FTB-C000571 / Indicator

Force Index

Force Index combines close-to-close price change with volume and then smooths the raw force.

Also known asEFIElder's Force Index

Intermediate Formula defined 1 linked topicEvidence-reviewed

Definitions

In plain terms

A higher close with volume creates positive force; a lower close creates negative force, and the smoothed series reduces one-bar noise.

Technical

RawForce_t=(C_t-C_(t-1))V_t; ForceIndex_t=EMA_13(RawForce_t) with an arithmetic seed over the first 13 raw-force values.

Scope

The exact period, seed, warm-up, and price/volume basis are part of the implementation contract.

Formula

RawForce_t=(C_t-C_(t-1))V_t; ForceIndex_t=EMA_13(RawForce_t)
LaTeX: ForceIndex_t = EMA_{13}((C_t-C_{t-1})V_t)
SymbolMeaningUnit
C_tcurrent closeprice
V_tcurrent volumevolume

Output unit: price-volume

Examples

  • A reviewer computes Force Index from a small OHLCV fixture and checks readiness, units, and edge cases before publication.

Common misconceptions

  • The exact period, seed, warm-up, and price/volume basis are part of the implementation contract.

Concept relationships

Prerequisites

Related

Required by

Where this concept is used

Evidence and governance

  1. Elder's Force Index (EFI) TradingView · official platform documentation

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

    Limits: Exact warm-up, seed, and smoothing settings remain an implementation contract.

  2. Volume indicators function group TA-Lib · first party technical publication

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

    Limits: Library compatibility does not by itself prove a project's seed, warm-up, or missing-data policy.

  3. Closing Price Investor.gov · official standard

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

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

  4. What Is Volume? CME Group · official exchange

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

    Limits: Futures contract conventions do not define every equity or digital-asset volume feed.

  5. Price Volume Trend (PVT) TradingView · official platform documentation

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

    Limits: Does not prescribe an adjustment policy, forecast, or trade direction.

Reviewed by
fintech-builder-batch-010
Last reviewed
2026-08-01
Next review
2027-08-01
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.