Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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compute


Selection of statistics to compute at each response level

Specification

Alias: none

Argument(s): none

Default: probabilities

Required/Optional Description of Group Dakota Keyword Dakota Keyword Description
Required
(Choose One)
Group 1 probabilities

Computes probabilities associated with response levels

reliabilities

Computes reliabilities associated with response levels

gen_reliabilities

Computes generalized reliabilities associated with response levels

Optional system

Compute system reliability (series or parallel)

Description

The compute keyword is used to select which forward stastical mapping is calculated at each response level.

Default Behavior

If response_levels is not specified, no statistics are computed. If response_levels is specified but compute is not, probabilities will be computed by default. If both response_levels and compute are specified, then on of the following must be specified: probabilities, reliabilities, or gen_reliabilities.

Expected Output

The type of statistics specified by compute will be reported for each response level.

Usage Tips

CDF/CCDF probabilities are calculated for specified response levels using a simple binning approach.

CDF/CCDF reliabilities are calculated for specified response levels by computing the number of sample standard deviations separating the sample mean from the response level.

Examples

method
  sampling
    sample_type random
    samples = 100 seed = 1
    complementary distribution
    response_levels = 3.6e+11 4.0e+11 4.4e+11
                      6.0e+04 6.5e+04 7.0e+04
                      3.5e+05 4.0e+05 4.5e+05
    compute reliabilities