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Arizona Financial Text System (AZFinText) is a quantitative textual financial prediction system written by Robert P. Schumaker of Central Connecticut State University and Hsinchun Chen of the University of Arizona. This system differs from other quants because it uses financial text as one of its key means of predicting stock price movement. This reduces the information lag-time problem evident in many similar systems where new information must be transcribed (e.g., such as losing a costly court battle or having a product recall), before the quant can react appropriately. AZFinText overcomes these limitations by utilizing the terms used in financial news articles to predict future stock prices twenty minutes after the news article has been released.〔Schumaker, R., (2006). (Textual Analysis of Stock Market Prediction Using Financial News Articles ). ''12th Americas Conference on Information Systems (AMCIS-2006)'', Aug 2006. Acapulco, Mexico.〕 It is believed that certain article terms can move stocks more than others. Terms such as ''factory exploded'' or ''workers strike'' will have a depressing effect on stock prices whereas terms such as ''earnings rose'' will tend to increase stock prices. When a human trading expert sees certain terms, they will react in a somewhat predictable fashion. AZFinText capitalizes on the arbitrage opportunities that exist when investment experts over and under-react to certain news stories. By analyzing breaking financial news articles and focusing on specific parts of speech, portfolio selection, term weighting and even article sentiment, the AZFinText system becomes a powerful tool and is a radically different way of looking at stock market prediction. == Overview of research == The foundation of AZFinText can be found in the ACM TOIS article.〔Schumaker, R. and Chen H., (2009). (Textual Analysis of Stock Market Prediction Using Breaking Financial News ). ''Association for Computing Machinery Transactions on Information Systems'', 27(2).〕 Within this paper, the authors tested several different prediction models and linguistic textual representations. From this work, it was found that using the article terms and the price of the stock at the time the article was released was the most effective model and using proper nouns was the most effective textual representation technique. Combining the two, AZFinText netted a 2.84% trading return over the five-week study period. AZFinText was then extended to study what combination of peer organizations help to best train the system.〔Schumaker, R. and Chen, H., (2009). (A Quantitative Stock Prediction System based on Financial News ). ''Information Processing and Management'', 45(5): 571-583.〕 Using the premise that IBM has more in common with Microsoft than GM, AZFinText studied the effect of varying peer-based training sets. To do this, AZFinText trained on the various levels of GICS and evaluated the results. It was found that sector-based training was most effective, netting an 8.50% trading return, outperforming Jim Cramer, Jim Jubak and DayTraders.com during the study period. AZFinText was also compared against the top 10 quantitative systems and outperformed 6 of them. A third study investigated the role of portfolio building in a textual financial prediction system.〔Schumaker, R. and Chen, H., (2008). (Evaluating a News-Aware Quantitative Trader: The Effects of Momentum and Contrarian Stock Selection Strategies ). ''Journal of the American Society for Information Science and Technology'', 59(2): 247-255.〕 From this study, Momentum and Contrarian stock portfolios were created and tested. Using the premise that past winning stocks will continue to win and past losing stocks will continue to lose, AZFinText netted a 20.79% return during the study period. It was also noted that traders were generally overreacting to news events, creating the opportunity of abnormal returns. A fourth study looked into using author sentiment as an added predictive variable.〔Schumaker, R., Zhang, Y. and Huang, C., (2008). (Sentiment Analysis of Financial News Articles ). ''20th Annual Conference of International Information Management Association'', Oct. 2009. Houston, TX.〕 Using the premise that an author can unwittingly influence market trades simply by the terms they use, AZFinText was tested using tone and polarity features. It was found that Contrarian activity was occurring within the market, where articles of a positive tone would decrease in price and articles of a negative tone would increase in price. A further study investigated what article verbs have the most influence on stock price movement.〔Schumaker, R., (2010). ( An Analysis of Verbs in Financial News Articles and their Impact on Stock Price ). ''NAACL Workshop on Social Media and Computational Linguistics'', June 2010. Los Angeles, CA.〕 From this work, it was found that ''planted'', ''announcing'', ''front'', ''smaller'' and ''crude'' had the highest positive impact on stock price. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AZFinText」の詳細全文を読む スポンサード リンク
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