| *.kernel | Kernel arithmetic |
| +.kernel | Kernel arithmetic |
| bart_depth_prior | Bayesian Additive Regression Tree (BART) features |
| b_bart | Bayesian Additive Regression Tree (BART) features |
| b_inter | N-way interaction basis |
| b_ker | Exact kernel feature basis |
| b_rff | Random Fourier feature basis |
| coef.ridge | Ridge regression |
| fitted.ridge | Ridge regression |
| kernel-arith | Kernel arithmetic |
| kernels | Kernel functions |
| k_lapl | Kernel functions |
| k_matern | Kernel functions |
| k_per | Kernel functions |
| k_rbf | Kernel functions |
| k_rq | Kernel functions |
| predict.ridge | Ridge regression |
| ridge | Ridge regression |
| step_basis | Recipe step for basis expansions |