Components kept separate, in the value's unit (literature SCHEMA.md, UNCERTAINTY_CALIBRATION.md): effective = max(sqrt(max(printed, reading, method)^2 + composition^2 + conversion^2), scatter). The method floor is the robust between-study scatter of the method class in ORCHID (calibrated) or a documented prior; printed values and printed uncertainties are unchanged.
Uncertainty budget of the literature values of Bi3Se2
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-26.4
kJ/mol-atom
5.000e-5
4.6 (emf, cleaned_below_threshold)
4.6
-26.405
kJ/mol-atom
5.000e-5
3.9 (model_calculated, calibrated)
3.9
-24.893
kJ/mol-atom
5.000e-5
9.966 (dft, calibrated)
9.966
Sources
Jiaqiang Zhou, Jiong Wang, Biao Hu, Dongyu Cui, Thermodynamic Modeling of the Bi-Se and Bi-Te Binary Systems, J. Phase Equilib. Diffus. 45, 89-113 (2024). doi:10.1007/s11669-024-01093-z