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 NiRu
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
14.6
kJ/mol-atom
5.000e-5
3.929 (dft, calibrated)
3.929
25.35
kJ/mol-atom
5.000e-5
3.929 (dft, calibrated)
3.929
Sources
Samuel Hallström, David Andersson, Andrei Ruban, John Ågren, Thermodynamic reassessment of the Ni–Ru system and assessment of the Al–Ni–Ru system at 1273–1523 K using ab initio calculations, Acta Materialia 56, 4062-4069 (2008). doi:10.1016/j.actamat.2008.04.028