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Sandra Williams
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Journal Articles
Publisher: Journals Gateway
Computational Linguistics (2012) 38 (1): 113–134.
Published: 01 March 2011
Abstract
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We describe a computational model for planning phrases like “more than a quarter” and “25.9 per cent” which describe proportions at different levels of precision. The model lays out the key choices in planning a numerical description, using formal definitions of mathematical form (e.g., the distinction between fractions and percentages) and roundness adapted from earlier studies. The task is modeled as a constraint satisfaction problem, with solutions subsequently ranked by preferences (e.g., for roundness). Detailed constraints are based on a corpus of numerical expressions collected in the N um G en project, 1 and evaluated through empirical studies in which subjects were asked to produce (or complete) numerical expressions in specified contexts.