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 CuTi2
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-8.6
kJ/mol (basis unstated)
1.62
5.000e-4
10.5 (unknown, calibrated)
10.5
-24.22
kJ/mol (basis unstated)
5.000e-4
11.7 (model_calculated, calibrated)
11.7
Sources
M. A. Turchanin, P. G. Agraval, A. R. Abdulov, Thermodynamic assessment of the Cu-Ti-Zr system. I. Cu-Ti system, Powder Metall Met Ceram 47, 344-360 (2008). doi:10.1007/s11106-008-9026-2