string

Discrete, epistemic uncertain variable - strings within a set

Topics

discrete_variables, epistemic_uncertain_variables

Specification

  • Alias: None

  • Arguments: INTEGER

  • Default: no discrete uncertain set string variables

Child Keywords:

Required/Optional

Description of Group

Dakota Keyword

Dakota Keyword Description

Optional

elements_per_variable

Number of admissible elements for each set variable

Required

elements

The permissible values for each discrete variable

Optional

set_probabilities

This keyword defines the probabilities for the various elements of discrete sets.

Optional

initial_point

Initial values for variables

Optional

descriptors

Labels for the variables

Description

Discrete set variables may be used to specify categorical choices which are epistemic. For example, if we have three possible forms for a physics model (model 1, 2, or 3) and there is epistemic uncertainty about which one is correct, a discrete uncertain set may be used to represent this type of uncertainty.

This variable is defined by a set of strings, in which the discrete value may take any value within the string set (for example, the set may be defined as ‘coarse’, ‘medium’, and ‘fine’)

Other epistemic types include:

Examples

discrete_uncertain_set
 string
 num_set_values 2             3
 set_values     'red' 'blue'  'coarse' 'medium' 'fine'
 descriptors    'ds1'         'ds2'