engineering.process.cpm_performance

Three distinct suites: educational examples on the calculator page, this legacy regression count (10/10 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 2026-09-24.o2-o3. Calculation version 1.0.1. CVP 1.0.0-proposed. 4/4 golden · 6/6 CVP boundary · 6/6 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 3/3 cross-interface · 6/6 CVP contract. digest 4ab6b02fc9cb. O2: overall Taguchi Ppm vs a separate-module sample identity (≤2 ULP). Not design-stage Cpm, not Pp/Ppk, and not a Ppm≥1.33 verdict. ≤2 ULP vs O3 applies only to the published tabulated Ppm vectors (on target, off target, below target, an alias, a wider sample, a target away from the midpoint, one awkward sample, and ddof=0). It is not a whole-domain guarantee and does not cover design-stage Cpm, Pp/Ppk, or a Ppm≥1.33 verdict.

• Golden (oracle-backed) 4 / 4
• CVP boundary 6 / 6
• Invalid input 6 / 6
• Property 1 / 1
• Metamorphic 1 / 1
• O3 high-precision 8 / 8
• Cross-interface 3 / 3
• 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 Overall Taguchi Ppm from a sample, LSL, USL, and a target, + O3 mpmath tabulated Ppm.
• Assurance Engineering
• Deferred Not design-stage Cpm, not Pp/Ppk, and not a Ppm≥1.33 verdict.

• 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 sha256:4ff23618d3067a3a883ef95350a14c09c240db54b91c80461c4b90a134d916a3

Input schema sha256:04e3e9d1a28e00fe749a3b4b47abdd6e6a4259dee0cac2370238e22cb85382fc · Output schema sha256:7c2278c6e981dcb2a6ec940bbeaaadc1e46bb6cbabea7760d99d6abd3cd952db · 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

cpm-performance

Engine

cpm-performance

Engine build

2026-09-24

Evidence core

2026-09-24T12:22:53.976Z

Rendered

2026-10-23T01:27:11.165Z

Last reviewed

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Assumptions

• Overall Taguchi Ppm = (USL−LSL)/(6√(s²+(x̄−target)²)) from a sample. s is summarizeSample.
• Not design-stage Cpm, not Pp/Ppk (no target), and not a 1.33 verdict.

Limitations

• Overall sample s — not design-stage Cpm from a stated σ
• Not Pp/Ppk (those have no target in the denominator)
• This page does not issue a Ppm≥1.33 verdict