ATCdata                 nodes of the ATC hierarchy
[,atctree-method        find a subset of the tree
atctree                 constructor for atctree objects
atctree-class           class to represent a tree from the ATC
                        hierarchy
cutting,atctree-method
                        cutting from an ATC tree
drugnames               display drug name for ATC codes
graft,atctree,atctree-method
                        graft (combine) trees
look,atctree-method     search the node texts for an expression
parents,atctree-method
                        show the parents for the specified node(s) in
                        the tree
parents,character-method
                        show the parents for the specified node(s) in
                        the full tree
plot,atctree-method     plot the tree as a network graph
pruning,atctree-method
                        prune an ATC tree
show,atctree-method     summarise atctree object
treelevs,atctree-method
                        helper functions for atctrees
