Measures for the degree of non-projectivity of dependency grammar have received attention both on the formal and on the empirical side. The empirical characterization of discontinuity in constituent treebanks annotated with crossing branches has nevertheless been neglected so far. In this paper, we present two measures for the characterization of both the discontinuity of constituent structures and the non-projectivity of dependency structures. An empirical evaluation on German data as well as an investigation of the relation between the measures and grammars extracted from treebanks shows their relevance. © 2011 Springer-Verlag.
Maier, W., & Lichte, T. (2011). Characterizing discontinuity in constituent treebanks. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 5591 LNAI, pp. 167–182). https://doi.org/10.1007/978-3-642-20169-1_11