Developing the Automated Sentiment Learning Algorithm to Build the Korean Sentiment Lexicon for Finance

서지정보

ㆍ발행기관 : 한국산업경영시스템학회 ㆍ수록지정보 : 산업경영시스템학회지 / 46권 / 1호
ㆍ저자명 : Su-Ji Cho, Ki-Kwang Lee, Cheol-Won Yang

목차

1. 서 론
2. 재무 분야 감성 분석 연구
3. 자료 및 방법론
3.1 자료 수집
3.2 감성사전 구축 알고리즘
3.3 분류기 성능의 평가
4. 결과 및 해석
5. 결 론
Acknowledgement
References

영어 초록

Recently, many studies are being conducted to extract emotion from text and verify its information power in the field of finance, along with the recent development of big data analysis technology. A number of prior studies use pre-defined sentiment dictionaries or machine learning methods to extract sentiment from the financial documents. However, both methods have the disadvantage of being labor-intensive and subjective because it requires a manual sentiment learning process. In this study, we developed a financial sentiment dictionary that automatically extracts sentiment from the body text of analyst reports by using modified Bayes rule and verified the performance of the model through a binary classification model which predicts actual stock price movements. As a result of the prediction, it was found that the proposed financial dictionary from this research has about 4% better predictive power for actual stock price movements than the representative Loughran and McDonald’s (2011) financial dictionary. The sentiment extraction method proposed in this study enables efficient and objective judgment because it automatically learns the sentiment of words using both the change in target price and the cumulative abnormal returns. In addition, the dictionary can be easily updated by re-calculating conditional probabilities. The results of this study are expected to be readily expandable and applicable not only to analyst reports, but also to financial field texts such as performance reports, IR reports, press articles, and social media.

참고 자료

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