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Dakota Reference Manual
Version 6.15
Explore and Predict with Confidence
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Aleatory uncertain variable - loguniform
This keyword is related to the topics:
Alias: none
Argument(s): INTEGER
Default: no loguniform uncertain variables
Child Keywords:
Required/Optional | Description of Group | Dakota Keyword | Dakota Keyword Description | |
---|---|---|---|---|
Required | lower_bounds | Specify minimum values | ||
Required | upper_bounds | Specify maximium values | ||
Optional | initial_point | Initial values for variables | ||
Optional | descriptors | Labels for the variables |
If the logarithm of an uncertain variable X has a uniform distribution, that is then X is distributed with a loguniform distribution. The distribution lower bound is
and upper bound is
The loguniform distribution has the density function:
For some methods, including vector and centered parameter studies, an initial point is needed for the uncertain variables. When not given explicitly, these variables are initialized to their means.