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 Fe3Ho
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-2.52
kJ/mol (basis unstated)
0.005
15.6 (model_calculated, calibrated)
15.6
-2
kJ/mol (basis unstated)
0.05
15.6 (model_calculated, calibrated)
15.6
Sources
S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, M. Ait Amar, L. Bouirden, A thermodynamic assessment of the Iron+Holmium phase diagram, The Journal of Chemical Thermodynamics 74, 78-84 (2014). doi:10.1016/j.jct.2013.11.037