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\iteman{io-port 05887465}
\itemau{Maier, Wolfgang; Lichte, Timm}
\itemti{Characterizing discontinuity in constituent treebanks.}
\itemso{de Groote, Philippe (ed.) et al., Formal grammar. 14th international conference, FG 2009, Bordeaux, France, July 25--26, 2009. Revised selected papers. Berlin: Springer (ISBN 978-3-642-20168-4/pbk). Lecture Notes in Computer Science 5591. Lecture Notes in Artificial Intelligence, 167-182 (2011).}
\itemab
Summary: 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.
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\itemli{doi:10.1007/978-3-642-20169-1\_11}
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