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Studying Lexical Dynamics and Language Change via Generalized Entropies: The Problem of Sample Size

  • Recently, it was demonstrated that generalized entropies of order α offer novel and important opportunities to quantify the similarity of symbol sequences where α is a free parameter. Varying this parameter makes it possible to magnify differences between different texts at specific scales of the corresponding word frequency spectrum. For the analysis of the statistical properties of natural languages, this is especially interesting, because textual data are characterized by Zipf’s law, i.e., there are very few word types that occur very often (e.g., function words expressing grammatical relationships) and many word types with a very low frequency (e.g., content words carrying most of the meaning of a sentence). Here, this approach is systematically and empirically studied by analyzing the lexical dynamics of the German weekly news magazine Der Spiegel (consisting of approximately 365,000 articles and 237,000,000 words that were published between 1947 and 2017). We show that, analogous to most other measures in quantitative linguistics, similarity measures based on generalized entropies depend heavily on the sample size (i.e., text length). We argue that this makes it difficult to quantify lexical dynamics and language change and show that standard sampling approaches do not solve this problem. We discuss the consequences of the results for the statistical analysis of languages.

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Author:Alexander KoplenigORCiDGND, Sascha WolferORCiDGND, Carolin Müller-SpitzerORCiDGND
Parent Title (English):Information Theory and Language
Place of publication:Basel
Editor:Łukasz Dębowski, Christian Bentz
Document Type:Part of a Book
Year of first Publication:2020
Date of Publication (online):2020/08/07
Tag:Jensen-Shannon divergence; Zipf's law; generalized divergence; generalized entropy; sample size; text length
GND Keyword:Entropie; Sprachstatistik; Sprachwandel; Stichprobenumfang; Zipfsches Gesetz
First Page:216
Last Page:233
DDC classes:400 Sprache / 400 Sprache, Linguistik
Open Access?:ja
Leibniz-Classification:Sprache, Linguistik
Linguistics-Classification:Quantitative Linguistik
Program areas:L3: Lexik empirisch und digital
Licence (English):License LogoCreative Commons - Attribution 4.0 International