Evaluating a German Sketch Grammar: A Case Study on Noun Phrase Case

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Authors

IVANOVA Kremena HEID Ulrich SCHULTE IM WALDE Sabine KILGARRIFF Adam POMIKÁLEK Jan

Year of publication 2008
Type Article in Proceedings
Conference Proceedings of the Sixth International Language Resources and Evaluation (LREC'08)
MU Faculty or unit

Faculty of Informatics

Citation
Web http://www.lrec-conf.org/lrec2008/
Field Informatics
Keywords sketch grammar; German
Description Word sketches are part of the Sketch Engine corpus query system. They represent automatic, corpus-derived summaries of the words' grammatical and collocational behaviour. Besides the corpus itself, word sketches require a sketch grammar, a regular expression-based shallow grammar over the part-of-speech tags, to extract evidence for the properties of the targeted words from the corpus. The paper presents a sketch grammar for German, a language which is not strictly configurational and which shows a considerable amount of case syncretism, and evaluates its accuracy, which has not been done for other sketch grammars. The evaluation focuses on NP case as a crucial part of the German grammar. We present various versions of NP definitions, so demonstrating the influence of grammar detail on precision and recall.
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