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 NiSe0.565
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-40.77
kJ/mol (basis unstated)
0.005
28 (unknown, calibrated)
28
Sources
Ondřej Zobač, Kateřina Buchlovská, Jana Pavlů, Aleš Kroupa, Thermodynamic Description of Binary System Nickel-Selenium, J. Phase Equilib. Diffus. 42, 468-478 (2021). doi:10.1007/s11669-021-00906-9