Catalogue of Artificial Intelligence Techniques


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Constituent Likelihood Grammar

Keywords: Probabilistic techniques

Categories: Natural Language

Author(s): Geoffrey Sampson, Karen Sp\"arck Jones

Natural language analysis techniques based on generative grammars normally make a sharp distinction between grammatical and ungrammatical sequences and thus fail when exposed to authentic discourse. Probabilistic techniques for (i) syntactic category assignment and (ii) syntactic structure determination use only the relative frequency of constructions and so do not rule anything out as ungrammatical. The CLAWS system developed at Lancaster University for word tagging using tag pair transition frequencies derived from a large, heterogeneous text corpus achieves 95-96



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