engineering.measurement.reproducibility

Three distinct suites: educational examples on the calculator page, this legacy regression count (8/8 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-25.o2-o3. Calculation version 1.0.1. CVP 1.0.0-proposed. 4/4 golden · 4/4 CVP boundary · 4/4 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 6/6 CVP contract. digest 83c7bec27893. O2: ISO 5725 s_R = hypot(s_r, s_L) and R = 2.8 s_R vs a separate-module identity (≤2 ULP). Not r from a sample. ≤2 ULP vs O3 applies only to the published tabulated reproducibility vectors. Not r from a sample.

• Golden (oracle-backed) 4 / 4
• CVP boundary 4 / 4
• Invalid input 4 / 4
• Property 1 / 1
• Metamorphic 1 / 1
• O3 high-precision 8 / 8
• Cross-interface 2 / 2
• CVP contract 6 / 6
• Interfaces PASS · UI (SSR) / REST / MCP
• Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
• Verified scope ISO 5725 s_R = hypot(s_r, s_L) and R = 2.8 s_R from stated components, + O3 mpmath tabulated reproducibility.
• Assurance Engineering
• Deferred Not r from a sample and not Gauge R&R.

• release artifacts aligned PASS
• schema output required declared PASS
• schema valid input executes PASS
• engine success output validates schema PASS
• schema rejects incomplete input PASS
• rest success payload validates schema PASS

Fingerprint sha256:5b015ec3dd20cfdff0f3a617c5e575ebfe114b88267d06cccd86de3fd8054ca1

Input schema sha256:42f7bae2c0f0dd8090378838e8c7631a9be58f1f647110cacec416fb8d177ad6 · Output schema sha256:891a33166441a9676a3331fbe8fd1dc3fcdf4db7a3f3f8822965c786d70aa563 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

reproducibility

Engine

reproducibility

Engine build

2026-09-24

Evidence core

2026-09-24T22:38:41.556Z

Rendered

2026-10-23T01:27:11.178Z

Last reviewed

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Assumptions

• ISO 5725 reproducibility: s_R = √(s_r²+s_L²), R = 2.8·s_R from stated components.
• s_r and s_L are ≥ 0. Both zero is valid (R = 0).
• Not r = 2.8·s from a sample, not AIAG GRR, and not combined RSS.
• Does not take a single s_R as input.

Limitations

• Takes stated s_r and s_L — not a sample and not a single s_R wrap
• Not ISO 5725 r = 2.8·s from repeats
• Not AIAG Gauge R&R AV / GRR
• Not combined RSS of a measurement model