FTB-C000035 / Indicator

McClellan Volume Summation Index

A cumulative breadth-volume index that adds each ready McClellan Volume Oscillator value to its prior level.

Also known asVolume Summation IndexVSI

Advanced Formula defined 1 linked topicPublished

Definitions

In plain terms

This index keeps a running total of the volume oscillator, so each ready daily oscillator value raises or lowers the accumulated volume-breadth path.

Technical

For ready volume oscillator MVO_t, update VSI_t = VSI_(t-1) + MVO_t; the documented volume convention and this pilot use a zero pre-output cumulative state.

Scope

The volume recurrence and zero starting convention are sourced; eligible volume, units, adjustment basis, initialization, precision, revisions, and missing sessions remain explicit package policies.

Formula

VSI_t = VSI_(t-1) + MVO_t; VSI_pre-output = 0
LaTeX: VSI_t=VSI_{t-1}+MVO_t,\quad VSI_{\mathrm{pre}}=0
SymbolMeaningUnit
VSI_tCurrent Volume Summation Indexshare-volume units
VSI_(t-1)Previous Volume Summation Indexshare-volume units
MVO_tReady McClellan Volume Oscillatorshare-volume units

Output unit: share-volume units

Examples

  • Starting from zero, volume oscillator increments of 1200 and negative 500 produce index levels 1200 and 700.

Common misconceptions

  • The cumulative volume level is path-dependent and cannot be interpreted without compatible input and starting conventions.

Concept relationships

Prerequisites

Broader concepts

Derived from

Where this concept is used

Tutorials planned

These catalogued topics use this concept, but their complete build has not shipped yet.

  • D04-F02-A06 Primary

Evidence and governance

  1. A Subtle Message in the Volume Summation Index McClellan Financial Publications · first party technical publication

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

    Limits: The article's market interpretation is excluded as evidence of forecasting, causation, thresholds, or profitable trading behavior.

  2. Understanding Oscillators and Other Indicators McClellan Financial Publications · first party technical publication

    Supports: historical attribution, variant distinction

    Limits: Historical publication conventions do not define a universal modern volume feed, adjustment basis, revision policy, or predictive result.

Reviewed by
Last reviewed
2026-07-26
Next review
2027-07-26
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.