Methodology corpus — this roster covers all published corpus versions (v1.1 Exposure current · v1.0 pinned historical · v2.0 pinned · v2.1 Experience Calibration current); every attestation is version-pinned to the layer and version it names.
Attestation Roster · Public

Corpus position: attestations are version-pinned per layer — Methodology v1.1 (Exposure Forecast, current), Methodology v1.0 (Exposure Forecast, pinned historical), and Methodology v2.1 (Experience Calibration) are each separately attestable. Full index: /methodology/.

The credentialed actuaries who have attested to this methodology.

An attestation is a credentialed actuary's signed statement that they have read the methodology document at the published version, applied their professional judgment, and find the document defensible. Attestations are version-pinned; a methodology version bump requires re-attestation. Compensation arrangements, where any exist, are disclosed publicly alongside each entry.

Methodology version v1.1 Current — Open for Attestation
Workforce Exposure Forecast — current Exposure layer. v1.1 introduces the BMI economic pathway ($93/BMI-point/person-year, Thorpe & Joski 2024, proposed — pending actuarial review), a versioned coefficient register, eligibility rules for the BMI pathway, bidirectional marker visibility, and an HbA1c module (disabled pending actuarial acceptance). Supersedes v1.0, which remains published and version-pinned as history. Reviewers who attested to v1.0 are invited to re-attest to v1.1. v1.1 attestations are version-specific; a v1.0 attestation does not transfer to v1.1.
Methodology version v1.0 Pinned Historical — Open for Attestation
FSA · MAAA Demonstration Signer
Marcus Chen, FSA, MAAA
Chen Actuarial Consulting
Attested v1.0 Date 2026 Compensation Demonstration entry — no live engagement

This entry is the demonstration signing actuary used on the published Sample Workforce Exposure Forecast (/sample-workforce-exposure-forecast.pdf). The signer name is illustrative; the methodology v1.0 to which the Sample is pinned is the same v1.0 document any live signing actuary would attest to. Live attestations appear immediately above this entry as they are submitted and verified.

Additional v1.0 attestations are being accepted now. Credentialed actuaries (ASA, FSA, MAAA, FCAS, ACAS) interested in attesting may submit per the protocol below.
Methodology addendum v2.1 Current — Open for Attestation
Workforce Claims Forecast / Experience Calibration. v2.1 is the current published addendum. It is additive to v1.0 — read v1.0 first — and supersedes v2.0 on two points (the §6 credibility-constant derivation and the §9 two-band construction); v2.0 remains published and version-pinned. A v2.1 attestation covers the claims-calibration layer and is version-specific — it does not transfer from a v1.0 or v2.0 attestation. Additional v2.1 attestations are being accepted now; credentialed actuaries (ASA, FSA, MAAA, FCAS, ACAS) may submit per the protocol below.

Submitting a v1.1 attestation

Credentialed actuaries (ASA, FSA, MAAA, FCAS, ACAS) may submit an attestation by reading the published v1.1 document and contacting Metra at care@usemetra.com with subject line “Methodology Attestation — v1.1”. The submission carries name, credential, firm, credential number, optional firm letterhead document, and a statement of attestation. Compensation arrangements (where any exist) are disclosed publicly on this roster alongside the entry.

Critiques and counter-derivations on v1.1 are welcomed and inform v1.2. Subject line “Methodology Review — v1.1”.

Submitting a v1.0 attestation

v1.0 is published and version-pinned as history at /methodology/v1.0/. Credentialed actuaries (ASA, FSA, MAAA, FCAS, ACAS) may still submit a v1.0 attestation (for example, when specifically attesting the original four-coefficient register). Submit by reading v1.0 and contacting care@usemetra.com with subject line “Methodology Attestation — v1.0”. A v1.0 attestation is version-specific — it does not transfer to v1.1.

Submitting a v2.1 attestation

The Workforce Claims Forecast / Experience Calibration addendum is attested separately from v1.0. Credentialed actuaries (ASA, FSA, MAAA, FCAS, ACAS) may submit by reading v1.0 first, then the published v2.1 document, and contacting Metra at care@usemetra.com with subject line “Methodology Attestation — v2.1”. The submission carries name, credential, firm, credential number, optional firm letterhead document, and a statement of attestation. Compensation arrangements (where any exist) are disclosed publicly on this roster alongside the entry.

Critiques and counter-derivations on v2.1 are equally welcomed and inform the next version. Subject line “Methodology Review — v2.1”.