It is also worth mentioning that phantom tokens, i.e., empty tokens inserted for the analysis of certain elliptical constructions (see section 2), have a labeled precision of 82.4 and a labeled recall of 82.8 (89.2 and 89.6 unlabeled), which is very close to the average accuracy, despite being very infrequent.
the features used are all symbolic and defined in terms of five different node attributes: • POS = part of speech (atomic) • DEP = dependency type Features of the type DEP have a special status in that they are extracted during parsing from the partially built dependency graph and are updated dynamically during parsing.