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


Choose a trend function for a Gaussian process surrogate

Specification

Alias: none

Argument(s): none

Default: reduced_quadratic

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

Constant trend function

linear

Use a linear polynomial or trend function

reduced_quadratic

Quadratic polynomials - main effects only

quadratic

Use a quadratic polynomial or trend function

Description

The only trend functions that are currently supported are polynomials.

The trend function is selected using the trend keyword, with options constant, linear, or reduced_quadratic. The reduced_quadratic trend function includes the main effects, but not mixed/interaction terms. The Surfpack GP (See surfpack) has the additional option of (a full) quadratic.