CVfoldsTree             Create balanced cross-validation folds for
                        hyperparameter tuning
Dat_Tree                Construct design data used for fitting
                        fusedTree models
PenOpt                  Tuning of the penalty parameters of fusedTree
                        using cross-validation
fusedTree               Fit a fusedTree model with or without fusion
                        penalty
predict.fusedTree       Predict Method for Fused Tree Models
