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 Fe3Mo2
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
4.037
kJ/mol-atom
5.000e-4
3.9 (model_calculated, calibrated)
3.9
2.297
kJ/mol-atom
5.000e-4
3.929 (dft, calibrated)
3.929
3.773
kJ/mol-atom
5.000e-4
3.929 (dft, calibrated)
3.929
Sources
V.B. Rajkumar, K.C. Hari Kumar, Thermodynamic modeling of the Fe–Mo system coupled with experiments and ab initio calculations, Journal of Alloys and Compounds 611, 303-312 (2014). doi:10.1016/j.jallcom.2014.05.030