| all_crossterms | Create crossterms from two matrices | 
| cov_nnls | Estimate non-negative diagonal terms on G matrix | 
| fui | Fast Univariate Inference for Longitudinal Functional Models | 
| G_estimate | Estimate covariance of random components G(s1, s2) | 
| G_estimate_randint | Special case of estimating covariance of random components G(s1, s2) | 
| G_generate | Creates the design matrix that allows for estimation of G | 
| plot_fui | Default FUI plotting | 
| pspline_setting | pspline.setting.R from refund | 
| select_knots | select_knots.R from refund package | 
| unimm | Fit a univariate mixed model |