FTB-C000024 / Implementation concept

Warm-Up Period

The initial span in which an indicator is accumulating enough eligible history to satisfy its declared initialization policy.

Also known asIndicator warm-up

Intermediate 14 linked topicsPublished

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

Related

Required by

Where this concept is used

Tutorials planned

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

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Evidence and governance

  1. 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.

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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.