| data | A dataset containing simulated feature long and wide data. The last six columns contain outcome variable, patient ID, treatment, time and time squared features. |
| FREEtree | Initial FREEtree call which then calls actual FREEtree methods depending on parameters being passed through. |
| FREEtree_PC | Version of FREEtree called when fixed_regress is NULL, uses principal components (PC) as regressors for non-grey modules. |
| FREEtree_time | Version of FREEtree called when var_select and fixed_regress are specified, |
| get_split_names | Method for extracting names of splitting features used in a tree. |