data.dtm                Document-term matrix for adjectives in
                        TripAdvisor hotel reviews
data.hc                 Hierarchical clustering tree for adjectives in
                        TripAdvisor data set
data.rating             TripAdvisor hotel review ratings
find.leaves             Find all descendant leaves of a node in an
                        hclust tree
group.plot              Visualize groups by coloring branches and
                        leaves of an hclust tree
group.recover           Recover aggregated groups of leaf indices
rare-package            Model path for tree-based lasso framework for
                        selecting rare features
rarefit                 Fit the rare feature selection model
rarefit.cv              Perform K-fold cross validation
rarefit.predict         Make predictions from a rarefit object and a
                        rarefit.cv object
tree.matrix             Generate matrix A encoding ancestor-descendant
                        relationships in an hclust tree
