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Why is it so difficult to compare treebanks? TIGER and TüBa-D/Z revisited

Rehbein, Ines and van Genabith, Josef (2007) Why is it so difficult to compare treebanks? TIGER and TüBa-D/Z revisited. In: TLT 2007 - The 6th International Workshop on Treebanks and Linguistic Theories, 7-8 December, 2007, Bergen, Norway.

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Abstract

This paper is a contribution to the ongoing discussion on treebank annotation schemes and their impact on PCFG parsing results. We provide a thorough comparison of two German treebanks: the TIGER treebank and the TüBa-D/Z. We use simple statistics on sentence length and vocabulary size, and more refined methods such as perplexity and its correlation with PCFG parsing results, as well as a Principal Components Analysis. Finally we present a qualitative evaluation of a set of 100 sentences from the TüBa-D/Z, manually annotated in the TIGER as well as in the TüBa-D/Z annotation scheme, and show that even the existence of a parallel subcorpus does not support a straightforward and easy comparison of both annotation schemes.

Item Type:Conference or Workshop Item (Paper)
Event Type:Workshop
Refereed:Yes
Uncontrolled Keywords:treebanks;
Subjects:Computer Science > Machine translating
DCU Faculties and Centres:Research Initiatives and Centres > National Centre for Language Technology (NCLT)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Computing
Official URL:http://tlt07.uib.no/index.php?page=main
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:15264
Deposited On:09 Mar 2010 16:05 by DORAS Administrator. Last Modified 09 Mar 2010 16:05

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