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 Be2Mo
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-31
kJ/mol (basis unstated)
0.05
11.7 (model_calculated, calibrated)
11.7
-29.3
kJ/mol (basis unstated)
0.05
25.18 (dft, calibrated)
25.18
Sources
Kazuyoshi Nakashima, Tatsuya Tokunaga, Hiroshi Ohtani, Mitsuhiro Hasebe, Thermodynamic Analysis of the Be-Mo Binary Phase Diagram, J. Japan Inst. Metals 71, 187-189 (2007). doi:10.2320/jinstmet.71.187