Modeling Lemma Frequency Bands for Lexical Complexity Assessment of Russian Texts

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The paper is devoted to the problem of modeling general-language frequency using data of large Russian corpora. Our goal is to develop a methodology for forming a consolidated frequency list which in the future can be used for assessing lexical complexity of Russian texts. We compared 4 frequency lists developed from 4 corpora (Russian National Corpus, ruTenTen11, Araneum Russicum III Maximum, Taiga). Firstly, we applied rank correlation analysis. Secondly, we used the measures “coverage” and “enrichment”. Thirdly, we applied the measure “sum of minimal frequencies”. We found that there are significant differences between the compared frequency lists both in ranking and in relative frequencies. The application of the “coverage” measure showed that frequency lists are by no means substitutable. Therefore, none of the corpora in question can be excluded when compiling a consolidated frequency list. For a more detailed comparison of frequency lists for different frequency bands, the ranked frequency list, based on RNC data, was divided into 4 equal parts. Then 4 random samples (containing 20 lemmas from each quartile) were formed.
Due to the wide range of values, accepted by ipm measure, relative frequency values are difficult to interpret. In addition, there are no reliable thresholds separating high-frequency, mid-frequency, and low-frequency lemmas. Meanwhile, to assess the lexical complexity of texts, it is useful to have a convenient way of distributing lemmas with certain frequencies over the bands of the frequency list. Therefore, we decided to assign lemmas “Zipf-values”, which made the frequency data interpretable because the range of measure values is small.
The result of our work will be a publicly accessible reference resource called “Frequentator”, which will allow to obtain interpretable information about the frequency of Russian words.
Translated title of the contributionМоделирование зон частотного словаря для оценки лексической сложности русских текстов
Original languageEnglish
Title of host publicationComputational Linguistics and Intellectual Technologies
Subtitle of host publicationProceedings of the International Conference “Dialogue 2020”, Moscow, June 17–20, 2020
EditorsВ.П. Селей
Place of PublicationМ.
Number of pages17
StatePublished - 2020
EventDIALOGUE-2020: компьютерная лингвистика в формате цифровых дискуссий - Москва, Russian Federation
Duration: 17 Jun 202020 Jun 2020

Publication series

NameКомпьютерная лингвистика и интеллектуальные технологии
PublisherРоссийский государственный гуманитарный университет
ISSN (Electronic)2075-7182


ConferenceDIALOGUE-2020: компьютерная лингвистика в формате цифровых дискуссий
CountryRussian Federation


  • Russian
  • linguistic corpora
  • lemma frequency lists
  • general-language frequency
  • frequency bands
  • low-frequency words
  • lexical complexity

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