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NgramPOS: a bigram-based linguistic and statistical feature process model for unstructured text classification

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Abstract

Research in financial domain has shown that sentiment aspects of stock news have a profound impact on volume trades, volatility, stock prices and firm earnings. In-depth analysis of stock news is now sourced from financial reviews by various social networking and marketing sites to help improve decision making. Nonetheless, such reviews are in the form of unstructured text, which requires natural language processing (NLP) in order to extract the sentiments. Accordingly, in this study we investigate the use of NLP tasks in effort to improve the performance of sentiment classification in evaluating the information content of financial news as an instrument in investment decision support system. At present, feature extraction approach is mainly based on the occurrence frequency of words. Therefore low-frequency linguistic features that could be critical in sentiment classification are typically ignored. In this research, we attempt to improve current sentiment analysis approaches for financial news classification by focusing on low-frequency but informative linguistic expressions. Our proposed combination of low and high-frequency linguistic expressions contributes a novel set of features for sentiment classification. The experimental results show that an optimal Ngram feature selection (combination of optimal unigram and bigram features) enhances sentiment classification accuracy as compared to other types of feature sets.

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Notes

  1. https://www.ling.upenn.edu/courses/Fall_2003/ling001/penn_treebank_pos.html.

  2. http://nlp.stanford.edu:8080/corenlp/process.

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Acknowledgements

This work is supported in partial by Universiti Tun Hussein Onn Malaysia.

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Authors and Affiliations

  1. Faculty of Computer Science and Information Technology, Universiti Putra Malaysia, Seri Kembangan, Malaysia

    Sepideh Foroozan Yazdani

  2. School of Computing, Edinburgh Napier University, Edinburgh, UK

    Zhiyuan Tan

  3. School of Science and Technology, Sunway University, Subang Jaya, Malaysia

    Mohsen Kakavand

  4. Faculty of Computer Science and Information Technology, Universiti Tun Hussein Onn Malaysia, Parit Raja, Malaysia

    Aida Mustapha

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  1. Sepideh Foroozan Yazdani
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  2. Zhiyuan Tan
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Correspondence to Sepideh Foroozan Yazdani.

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Foroozan Yazdani, S., Tan, Z., Kakavand, M. et al. NgramPOS: a bigram-based linguistic and statistical feature process model for unstructured text classification. Wireless Netw 28, 1251–1261 (2022). https://doi.org/10.1007/s11276-018-01909-0

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