- Restrict the calibration negative anchor to Firms B/C/D, fiscal years
2013-2019 (pre-electronic-signature hand-signing period); B/C/D adopted
e-signing post-2020 at staggered times, so 2013-2019 is the construct-clean
baseline. Firm A scored across its full 2013-2023 record against it.
- New locked numbers (codex-audited, Scripts 54/55): per-comparison HC floor
0.000010; per-signature HC floor 0.0059 [boot 0.0045-0.0073]; per-document
HC 0.0117 / HC+MC 0.1753; per-firm HC+MC B 0.162 / C 0.225 / D 0.089.
Firm A observed 0.817 = ~139x the clean floor (was ~70x on all-period BCD);
Firm A out-of-sample vs clean pool 0.0001 (below floor -> never resembles
genuine hand-signing). BCD 2020+ robustness: per-sig 0.0105, per-comparison
0.000036 (~2x pre-2020) quantifies the e-signing contamination.
- Propagated through abstract / Sec. I / III-L / IV-M / V / conclusion;
0.837 crossover kept corpus-wide; ABCD retained as contamination comparison.
- Grounded the 2013-2019 choice on data (floor drift) + e-sign-adoption
background, not on in-text interview claims (double-blind).
- Add Scripts 54 (temporal floor stability) and 55 (BCD 2013-2019 primary
calibration + Firm A scoring).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
