Methodology changelog

CAERI methodology is versioned; changes are documented here. The live index runs on v1.0.0. Every published version is version-stamped and reproducible.

Version history

Version	Change
v1.0.0 · 2026-09-18	Disclosure change — no change to data, weights or structure, and therefore no version change. The published methodology was expanded from Sections 1–4 to the full specification: the county-estimate validation results including the stricter county-level test that comes in above our self-set target (§5.1), the exposure-ensemble weights and the confidence-rating formula (§6.1, §6.3), the pillar weights with their rationale (§6.2), the validation programme with two of its four items marked not yet run (§7), known limitations with figures from our own analysis of the index (§8), and the index's relationship to the prior published research it builds on (§9). Two blocks remain withheld and are identified as such. County pages now report their own state's measured validation figure in place of a pass/fail statement against that target. No score, rank, percentile or band moved.
v1.0.0	First public release. The initial published version of the CAERI methodology and the national county index: every U.S. county scored on the five-pillar exposure-and-resilience framework, on a dual national and in-state basis, from public federal data with a confidence rating on every score.

Version

Change

v1.0.0 · 2026-09-18

Disclosure change — no change to data, weights or structure, and therefore no version change. The published methodology was expanded from Sections 1–4 to the full specification: the county-estimate validation results including the stricter county-level test that comes in above our self-set target (§5.1), the exposure-ensemble weights and the confidence-rating formula (§6.1, §6.3), the pillar weights with their rationale (§6.2), the validation programme with two of its four items marked not yet run (§7), known limitations with figures from our own analysis of the index (§8), and the index's relationship to the prior published research it builds on (§9). Two blocks remain withheld and are identified as such. County pages now report their own state's measured validation figure in place of a pass/fail statement against that target. No score, rank, percentile or band moved.

v1.0.0

First public release. The initial published version of the CAERI methodology and the national county index: every U.S. county scored on the five-pillar exposure-and-resilience framework, on a dual national and in-state basis, from public federal data with a confidence rating on every score.

Full detail is in the published methodology. What each version level means, and the rules under which the index may change, are in the governance & recalibration policy.