FTB-C000427 / Implementation concept

Williams Percent R Boundary

Williams Percent R Boundary is the governed endpoint behavior of Williams Percent R at the rolling high and low.

Also known as%R endpoint state

Foundation 1 linked topicPublished

Definitions

In plain terms

A close at the high maps to zero and a close at the low maps to minus 100 when the range is nonzero.

Technical

Equality tolerance, price precision, clamping, zero range, and finalized-bar status must be explicit.

Scope

A boundary touch is not an automatic trade or reversal signal.

Examples

  • A governed lesson calculates or identifies Williams Percent R Boundary only after its inputs, window, state, scale, and edge cases are declared.

Common misconceptions

  • A boundary touch is not an automatic trade or reversal signal.

Concept relationships

Prerequisites

Related

Where this concept is used

Tutorials planned

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

  • D07-F03-A04 Important

Evidence and governance

  1. Williams Percent R TA-Lib · first party technical publication

    Supports: preferred label, short definition, technical definition

    Limits: Lookback endpoints, zero-range behavior, and threshold interpretation remain implementation and research choices.

Reviewed by
fintech-builder-batch-008
Last reviewed
2026-07-29
Next review
2027-07-29
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.