Definitions
In plain terms
A recursive indicator may need several valid observations before it can show a trustworthy, fully initialized output. That opening span is its warm-up period.
Technical
The warm-up period is the ordered prefix of eligible inputs consumed before all required recursive states are initialized under a declared seed and readiness contract.
Scope
Warm-up length is package policy unless a methodology explicitly fixes it; it is distinct from calendar elapsed time when sessions are missing or ineligible.
Examples
- An EMA seeded with the first 19 eligible observations remains in warm-up until all 19 have been accepted.
Common misconceptions
- A warm-up period is not automatically the same as the number of calendar days since the dataset began.
Concept relationships
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
- ImportantRatio-Adjusted Summation Index (RASI)D04-F02-A04
- 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: variant distinction
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