Abstract
The structure of written texts is analyzed by focusing on word sequences. As a method, word sequences in texts are transformed into rank sequences of the occurrence frequency of each word and return maps are drawn. The features of word sequences are extracted by comparing with the surrogate data, i.e., a sequence in which all the words are randomly rearranged. A total of 140 written texts consisting of ten languages are selected for analysis. To characterize the distribution in the return map quantitatively, two characteristic quantities are defined, the distance between the original distribution and surrogate distribution, and the correlation coefficient of the adjacent word ranks. The results show that there is a negative correlation in the rank of adjacent words in almost all languages, and features of return maps of the same language texts are similar. A clustering structure which implies the relation to language (sub)family is observed. A mathematical model is proposed for reproducing features of the return map for multiple languages. The numerical simulations achieve results similar to those of the real data quantitatively.
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The manuscript has associated data in a data repository. [Authors’ comment: This manuscript has data included as electronic supplementary material. The online version of this article contains supplementary material, which is available to authorized users.].
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Acknowledgements
The authors would like to thank Prof. Suzuki for useful advice on linguistic typology. T. M. would like to thank Prof. Horita for useful discussions.
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The negative correlation of rank in Moby Dick is found by S. Y. The analysis of real texts under the common condition is performed by T. Y. The model is suggested and analyzed by T. Y. and T. M. The paper is written by T. Y. and T. M.
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Yamamoto, T., Yamada, S. & Mizuguchi, T. Negative correlation of word rank sequence in written texts. Eur. Phys. J. B 94, 200 (2021). https://doi.org/10.1140/epjb/s10051-021-00210-y
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DOI: https://doi.org/10.1140/epjb/s10051-021-00210-y