Keyness: Appropriate metrics and practical issues

Gabrielatos, Costas and Marchi, Anna (2012) Keyness: Appropriate metrics and practical issues. CADS International Conference 2012. Corpus-assisted Discourse Studies: More than the sum of Discourse Analysis and computing?, 13-14 September, University of Bologna, Italy.

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Abstract

In this paper we examine the definitions of two widely-used interrelated constructs in corpus linguistics, keyness and keywords, as presented in the literature and corpus software manuals. In particular, we focus on a. the consistency of definitions given in different sources; b. the metrics used to calculate the level of keyness; c. the compatibility between definitions and metrics. Our survey of studies employing keyword analysis has indicated that the vast majority of studies examine a subset of keywords – almost always the top X number of keywords as ranked by the metric used. This renders the issue of the appropriate metric central to any study using keyword analysis. In this study, we first argue that an appropriate, and therefore useful, metric for keyness needs to be fully consistent with the definition of keyword. We then use four sets of comparisons between corpora of different types and sizes, in order to test whether and to what extent the use of different metrics affects the ranking of keywords. More precisely, we look at the extent of overlap in the keyword rankings resulting from the adoption of different metrics, and we discuss the implications of ranking-based analysis adopting one metric or another. Finally, we propose a new metric for keyness, and demonstrate a simple way to calculate the metric, which supplements the keyword extraction in existing corpus software.

Item Type: Conference or Workshop Item (Paper)
Additional Information: This is a revised version of: Gabrielatos, C. & Marchi, A. (2011). Keyness: Matching metrics to definitions. Invited presentation. Corpus Linguistics in the South: Theoretical-methodological challenges in corpus approaches to discourse studies - and some ways of addressing them. University of Portsmouth, 5 November 2011. [http://repository.edgehill.ac.uk/4100/]
Uncontrolled Keywords: corpus linguistics, keyness, keywords, metrics, frequency difference, effect size, statistical significance
Subjects: P Language and Literature > PE English
Divisions: English Language & Literature
Date Deposited: 19 Sep 2012 14:27
URI: http://repository.edgehill.ac.uk/id/eprint/4196

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