英文摘要
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As one of the main method for listed companies to raise funds, the stock market is also one of the objects with relatively low capital level and relatively easy operation. Its changes affect the entire market economy. In order to ensure the fairness and transparency of the market information, governments and investors of all countries focus on information disclosure. The Market Observation Post System of the Taiwan Stock Exchange provides the financial, operational and corporate governance information of all companies. From the point of view of the stock market analysis method, although the information disclosed by the Market Observation Post System is more accurate than other market information, however, can there be a large amount of information be digested and accepted by investors? Can it really help investors make correct judgments? In order to achieve the benefits of the information disclosure system, investors should be able to effectively use these information and make correct investment decisions. This research uses material information of listed companies in the Market Observation Post System as text input data, and TCRI credit ratings of listed companies as target variables. Text classification technology in text mining is used to classify text. In natural language processing, Jieba word segmentation system, TF-IDF method and Bag-of-Words (BoW) Model are used to segment words, calculate word importance and convert words into structured vectors, respectively. Based on the structured vectors, this research constructs an early risk warning model, which evaluates and compares the effects of the model. The purposes of this research are to provide investors with correct reference for investment decisions and verify the effectiveness of material information.
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