| Data compilation |
Verify every compiled value against the original source and keep a correction log |
185 corrections for 181 records during the source audit, including 38 conversions from atomic to mass percent and the exclusion of one conversion-electron measurement (Section 2.1; SI Methods S1.3) |
| Record how the literature was searched, including any filters, and assess what the search could not reach |
The original search log was not preserved (Section 2.1); the retrospective audit was therefore fully documented, and its open-access recall was 12.5% for publications before 2010 and 47.8% for later publications (Section 4.5; SI Table S1f) |
| State who made eligibility and grouping decisions and which rules were applied |
All decisions made by the authors from the sources under stated rules; retrospective states documented individually (Section 2.1; SI Table S1d and e) |
| Target definition |
Define the target from measured quantities and test its sensitivity to any threshold |
Operational high-field fraction above 10 T; R2 of 0.422, 0.422 and 0.416 at 5, 10 and 15 T (Section 2.2; SI Table S2) |
| Validation design |
Check whether records with different identifiers originate from the same experiment, and define the unit of independence before splitting the data |
45 publications formed 37 provenance groups; 11 publications belonged to three shared specimen series (Section 2.3) |
| Apply the same grouping in model selection as in model evaluation, and report how performance changes across validation designs |
With grouping applied at both levels, median R2 was 0.670, 0.322 and 0.287 for state-random, publication-disjoint and provenance-disjoint evaluation (Sections 2.6.1 and 3.2) |
| Model comparison |
Include a simple, physically motivated baseline |
The calibrated martensite-start comparator reached a pooled R2 of 0.354, which made it possible to test whether the flexible model (0.422) adds information (Sections 2.4 and 3.6) |
| Report group-balanced metrics with confidence intervals alongside pooled metrics |
The flexible model had the lower error in only 17 of 37 groups; ΔMAE −1.73 pp (95% CI −7.87 to 4.52) (Section 3.6) |
| Uncertainty |
Report prediction intervals under the same grouping, with both coverage and width |
Mean coverage of 90.2% with a median interval width of 92.1 pp on a 0 to 100 pp scale (Section 3.7) |
| Reporting |
Specify analyses and decision rules before running them, and report hypotheses that were not supported |
Two prespecified hypotheses not advanced (Section 3.8; SI Note S1) |
| Release the curated data, correction log, group assignments and code |
Public repository with integrity checksums (Section 6.5) |
