Sentiment analysis for the Japanese stock market
by Hiroshi Ishijima; Takuro Kazumi; Akira Maeda
Global Business and Economics Review (GBER), Vol. 17, No. 3, 2015

Abstract: This study analyses the sentiment towards the Japanese economy that might appear in daily news articles between 1 January 2007 and 30 September 2012. To quantify such a sentiment, we created an index that accounts for the frequency of occurrence of words that affirmatively or negatively describe the current economic situation. Articles were taken from the Nikkei, a popular newspaper in Japan comparable with the Wall Street Journal in the USA. Using a cutting-edge text mining technique, we counted the numbers of 'positive' as well as 'negative' words in the newspaper articles. Constructing a daily summary index, we then performed statistical analysis to examine correlations between the sentiment index and Tokyo Stock Exchange prices. One interesting finding is that the index significantly predicts stock prices of three days in advance.

Online publication date: Thu, 02-Jul-2015

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