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Dakota Reference Manual
Version 6.15
Explore and Predict with Confidence
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Output moments of the specified type and include them within the set of final statistics.
Alias: none
Argument(s): none
Default: standard
Child Keywords:
Required/Optional | Description of Group | Dakota Keyword | Dakota Keyword Description | |
---|---|---|---|---|
Required (Choose One) | Objective Formulation (Group 1) | none | Omit moments from the set of final statistics. | |
standard | Select standard rejection | |||
central | Output central moments and include them within the set of final statistics. |
When performing a nested study that may employ moment statistics on the inner loop, it can be desirable to control the type of these moments. The final_moments
specification supports options of none
, standard
(default), or central
, corresponding to omission of moments, standardized moments (mean, standard deviation, skewness, and excess kurtosis), or central moments (mean, variance, 3rd central, and 4th central).
The presence or omission of moment results in the final statistics influences the outer level mappings in the case of a nested study. For example, final_moments
none
can allow for a more compact specification of primary and/or secondary response mappings.
The following method specification overrides the default to print central
moments and include them in the set of final statistics.
method, sampling samples = 50 seed = 1234 response_levels = 3.6e+11 1.2e+05 3.5e+05 final_moments central
Overriding the default to none
as follows:
method, sampling samples = 50 seed = 1234 response_levels = 3.6e+11 1.2e+05 3.5e+05 final_moments none
allows associated nested model mappings to be simplified from:
model nested sub_method_pointer = 'UQ' primary_response_mapping = 0. 0. 1. 0. 0. 1. 0. 0. 0. secondary_response_mapping = 0. 0. 0. 0. 0. 0. 0. 0. 1.
to a more compact version focused only on the response level mappings (two leading zeros per response function for moment mappings have been removed):
model nested sub_method_pointer = 'UQ' primary_response_mapping = 1. 1. 0. secondary_response_mapping = 0. 0. 1.