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In computational linguistics, lexical density constitutes the estimated measure of content per functional (grammatical) and lexical units (lexemes) in total. It is used in discourse analysis as a descriptive parameter which varies with register and genre. Spoken texts tend to have a lower lexical density than written ones, for example.
Lexical density may be determined thus:
= the analysed text's lexical density
= the number of lexical word tokens (nouns, adjectives, verbs, adverbs) in the analysed text
= the number of all tokens (total number of words) in the analysed text
(The variable symbols applied herein are by no means conventional; they were arbitrarily chosen for the nonce to illustrate the example in question.)
- Ure, J (1971). Lexical density and register differentiation. In G. Perren and J.L.M. Trim (eds), Applications of Linguistics, London: Cambridge University Press. 443-452.
- Lexical Density Test definition NOTE: This page gives an incorrect formula and confuses lexical density with type/token ratio.
- Lexical density 'Textalyser' NOTE: This ALSO confuses lexical density with type/token ratio.
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