Quantitative Criteria for Computational Chinese Lexicography A Study Based on a Standard Reference Lexicon for Chinese NLP: Topic Areas: (D) electronic dictionaries, (h) large corpora

The construction of a standard reference lexicon for Chinese NLP involves two fundamental issues in computational linguistics: the definition of a word and the principled delimitation of the lexicon. We argued that such reference lexicons must-be judged by their cross-domain portability, expressive adequacy, and reusability. Thus principles for lexical selection must also be driven these criteria. This paper reports the approach and result of our construction of a standard reference lexicon for Chinese NLP, which also serves as the empirical basis for a segmentation standard. Our approach uses a mixture if stochastic and heuristic steps. First, a reference corpus is selected and lexical entries are automatically extracted from it based on statistically significant threshold. Second, the coverage of the automatically extracted lexicon is enhanced by conceptual primes as well as by comparative studies of MRD's from different Chinese speaking communities. We show the satisfactory coverage of the resultant lexicon by testing it with randomly accessed texts from the web.