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Are all the word ranking methods the same?

Author

Listed:
  • Elham Najafi

    (Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran)

  • Alireza Valizadeh

    (Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran)

  • Amir H. Darooneh

    (��Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario, Canada‡University of Zanjan, P. O. Box 45196-313, Zanjan, Iran)

Abstract

Text as a complex system is commonly studied by various methods, like complex networks or time series analysis, in order to discover its properties. One of the most important properties of each text is its keywords, which are extracted by word ranking methods. There are various methods to rank words of a text. Each method differently ranks words according to their frequency, spatial distribution or other word properties. Here, we aimed to explore how similar various word ranking methods are. For this purpose, we studied the rank correlation of some important word ranking methods for number of sample texts with different subjects and text sizes. We found that by increasing text size the correlation between ranking methods grows. It means that as the text size increases, the associated word ranks calculated by different ranking methods converge. Also, we found out that the rank correlations of word ranking methods approach their maximum value in the case of large enough texts.

Suggested Citation

  • Elham Najafi & Alireza Valizadeh & Amir H. Darooneh, 2021. "Are all the word ranking methods the same?," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 32(11), pages 1-11, November.
    • Handle: RePEc:wsi:ijmpcx:v:32:y:2021:i:11:n:s0129183121501448
    DOI: 10.1142/S0129183121501448
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