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 Pd9Si2
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-42.7
kJ/mol (basis unstated)
0.05
49.83 (dft, calibrated)
49.83
-42.7
kJ/mol (basis unstated)
0.05
49.83 (dft, calibrated)
49.83
Sources
S. H. Zhou, Y. Huo, Ralph E. Napolitano, Phase Stability for the Pd-Si System: First-Principles, Experiments, and Solution-Based Modeling, Metall Mater Trans A 47, 194-208 (2016). doi:10.1007/s11661-015-3206-8