tailieunhanh - Báo cáo khoa học: "Sentiment Polarity Identification in Financial News: A Cohesion-based Approach"

Text is not unadulterated fact. A text can make you laugh or cry but can it also make you short sell your stocks in company A and buy up options in company B? Research in the domain of finance strongly suggests that it can. Studies have shown that both the informational and affective aspects of news text affect the markets in profound ways, impacting on volumes of trades, stock prices, volatility and even future firm earnings. | Sentiment Polarity Identification in Financial News A Cohesion-based Approach Ann Devitt Khurshid Ahmad School of Computer Science Statistics School of Computer Science Statistics Trinity College Dublin Ireland Trinity College Dublin Ireland Abstract Text is not unadulterated fact. A text can make you laugh or cry but can it also make you short sell your stocks in company A and buy up options in company B Research in the domain of finance strongly suggests that it can. Studies have shown that both the informational and affective aspects of news text affect the markets in profound ways impacting on volumes of trades stock prices volatility and even future firm earnings. This paper aims to explore a computable metric of positive or negative polarity in financial news text which is consistent with human judgments and can be used in a quantitative analysis of news sentiment impact on financial markets. Results from a preliminary evaluation are presented and discussed. 1 Introduction Research in sentiment analysis has emerged to address the research questions what is affect in text what features of text serve to convey it how can these features be detected and measured automatically. Sentence and phrase level sentiment analysis involves a systematic examination of texts such as blogs reviews and news reports for positive negative or neutral emotions Wilson et al. 2005 Grefenstette et al. 2004 . The term sentiment analysis is used rather differently in financial economics where it refers to the derivation of market confidence indicators from proxies such as stock prices and trading volumes. There is a tradition 984 going back to the Nobel Sveriges-Riksbank Laureates Herbert Simon 1978 Prize and Daniel Kah-neman 2002 Prize that shows that investors and traders in such markets can behave irrationally and that this bounded rationality is inspired by what the traders and investors hear from others about the conditions that may or