FTB-C000033 / Indicator

Ratio-Adjusted Summation Index

A cumulative index that adds each ready Ratio-Adjusted McClellan Oscillator value to its prior level.

Also known asRASIRatio-Adjusted McClellan Summation Index

Advanced Formula defined 1 linked topicPublished

Definitions

In plain terms

RASI builds a running path from the normalized McClellan oscillator, reducing the direct scale effect of changes in the number of advancing and declining issues.

Technical

After computing ratio-adjusted oscillator RAMO_t from r_t = 1000(A_t-D_t)/(A_t+D_t), update RASI_t = RASI_(t-1) + RAMO_t; this pilot uses a zero pre-output seed.

Scope

The ratio adjustment and cumulative relationship are methodology facts; the pilot's zero seed, zero-denominator result, initialization, precision, revisions, and missing-session behavior are explicit policies.

Formula

RASI_t = RASI_(t-1) + RAMO_t; RASI_pre-output = 0 in this pilot
LaTeX: RASI_t=RASI_{t-1}+RAMO_t,\quad RASI_{\mathrm{pre}}=0\ \text{in this pilot}
SymbolMeaningUnit
RASI_tCurrent Ratio-Adjusted Summation Indexscaled breadth points
RASI_(t-1)Previous Ratio-Adjusted Summation Indexscaled breadth points
RAMO_tReady Ratio-Adjusted McClellan Oscillatorscaled breadth points

Output unit: scaled breadth points

Examples

  • Starting from zero, ratio-adjusted oscillator values 8 and negative 3 produce RASI levels 8 and 5.

Common misconceptions

  • Ratio adjustment reduces universe-scale sensitivity but does not make different universe definitions interchangeable.

Concept relationships

Prerequisites

Broader concepts

Contrasts with

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-A04 Primary

Evidence and governance

  1. Ratio Adjusted Summation Index McClellan Financial Publications · first party methodology

    Supports: preferred label, short definition, technical definition, formula, historical attribution, variant distinction

    Limits: Historical interpretive thresholds are not universal trading rules; the source does not prescribe the package's evidence or software failure policies.

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.