Definitions
In plain terms
A larger smoothing constant makes an EMA respond faster to new data, while a smaller value makes it change more slowly and remember older observations longer.
Technical
In EMA_t = EMA_(t-1) + alpha(z_t - EMA_(t-1)), alpha is a dimensionless value between zero and one that multiplies the current forecast error.
Scope
This concept describes the recurrence weight; it does not independently specify initialization, warm-up length, missing-data handling, or predictive value.
Examples
- Alpha 0.10 closes 10 percent of the gap between the prior EMA and the current observation.
Common misconceptions
- A 10 percent smoothing constant does not mean only the latest ten observations are used.
Concept relationships
Feeds into
Where this concept is used
- ImportantTraditional McClellan Oscillator: Compare Fast and Slow Raw BreadthD04-F02-A01
- ImportantRatio-Adjusted McClellan OscillatorD04-F02-A02
- ImportantTraditional McClellan Summation IndexD04-F02-A03
- ImportantMcClellan Volume OscillatorD04-F02-A05
- ImportantMcClellan Volume Summation IndexD04-F02-A06
- ImportantExponential Moving Average (EMA)D07-F01-A02
Evidence and governance
- Calculating the McClellan Oscillator McClellan Financial Publications · first party methodology
Supports: preferred label, short definition, technical definition, formula, units
Limits: Does not prescribe one universal initialization, missing-session, revision-resolution, rounding, or software interface policy.
- Reviewed by
- fintech-builder-owner-approved
- Last reviewed
- 2026-07-26
- Next review
- 2027-07-26
- Record status
- published