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 Y13Zn58
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-37
kJ/mol-atom
2
0.5
3.5 (unknown, calibrated)
3.5
-36
kJ/mol-atom
0.05
3.9 (model_calculated, calibrated)
3.9
-32
kJ/mol-atom
0.5
3.9 (model_calculated, calibrated)
3.9
Sources
G. Shao, V. Varsani, Z. Fan, Thermodynamic modelling of the Y–Zn and Mg–Zn–Y systems, Calphad 30, 286-295 (2006). doi:10.1016/j.calphad.2006.03.005