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Guide to Expression of Uncertainty in Measurement
ISO GUM (2010)
precision ≠ accuracy
Type A (statistical: standard deviation of results)
Type B (non-Type A uncertainties)
Law of Propagation of Uncertainty (no covariations)
TG-138 applies principles for expressing brachytherapy
dosimetric uncertainties
expanded uncertainty,
k
= 2 (95.45% confidence, 21/22)
special case for large # DOF
k
= t-factor otherwise with covariations
Methodology for Uncertainty Estimation
DeWerd, et al,
Med. Phys.
38, 782-801 (2011)