is given by Helton and
Davis (2003).
4.1. Data uncertainty engine (DUE)
Uncertainty in data may be described in 13 uncertainty
cat-
egories (Table 2) depending on how data varies in time and
space (Brown et al., 2005). Each data category is associated
with a range of uncertainty models, for which more specific
probability density functions (pdfs) may be developed with
different simplifying assumptions
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