1Blurb::
2Choose a trend function for a Gaussian process surrogate
3Description::
4The only trend functions that are currently supported are polynomials.
5
6The trend function is selected using the \c trend
7keyword, with options \c constant, \c linear, or \c reduced_quadratic.
8The \c reduced_quadratic trend function includes the main
9effects, but not mixed/interaction terms.
10The Surfpack GP (See \ref model-surrogate-global-gaussian_process-surfpack)
11has the additional option of (a full) \c
12quadratic.
13
14Topics::
15Examples::
16Theory::
17Faq::
18See_Also::
19