.. _method-bayes_calibration-queso-emulator-pce-expansion_order-collocation_points-cross_validation: """""""""""""""" cross_validation """""""""""""""" Use cross validation to choose the 'best' polynomial order of a polynomial chaos expansion. .. toctree:: :hidden: :maxdepth: 1 method-bayes_calibration-queso-emulator-pce-expansion_order-collocation_points-cross_validation-noise_only method-bayes_calibration-queso-emulator-pce-expansion_order-collocation_points-cross_validation-max_cv_order_candidates **Specification** - *Alias:* None - *Arguments:* None **Child Keywords:** +-------------------------+--------------------+-----------------------------+---------------------------------------------+ | Required/Optional | Description of | Dakota Keyword | Dakota Keyword Description | | | Group | | | +=========================+====================+=============================+=============================================+ | Optional | `noise_only`__ | Restrict the cross validation process to | | | | estimating only the best noise tolerance. | +----------------------------------------------+-----------------------------+---------------------------------------------+ | Optional | `max_cv_order_candidates`__ | Limit the number of cross-validation | | | | candidates for basis order | +----------------------------------------------+-----------------------------+---------------------------------------------+ .. __: method-bayes_calibration-queso-emulator-pce-expansion_order-collocation_points-cross_validation-noise_only.html __ method-bayes_calibration-queso-emulator-pce-expansion_order-collocation_points-cross_validation-max_cv_order_candidates.html **Description** Use cross validation to choose the 'best' polynomial degree of a polynomial chaos expansion. 10 fold cross validation is used to estimate the cross validation error of a total-order polynomial expansion for orders 1 through to order. The order chosen is the one that produces the lowest cross validation error. If there are not enough points to perform 10 fold cross validation then one-at-a-time cross validation will be performed.