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Timm O. Sprenger Philipp G. Sandner Andranik Tumasjan Isabell M. Welpe 《Journal of Business Finance & Accounting》2014,41(7-8):791-830
This study presents a methodology for identifying a broad range of real‐world news events based on microblogging messages. Applying computational linguistics to a unique dataset of more than 400,000 S&P 500 stock‐related Twitter messages, we distinguish between good and bad news and demonstrate that the returns prior to good news events are more pronounced than for bad news events. We show that the stock market impact of news events differs substantially across different categories. 相似文献
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Timm O. Sprenger Andranik Tumasjan Philipp G. Sandner Isabell M. Welpe 《European Financial Management》2014,20(5):926-957
Microblogging forums (e.g., Twitter) have become a vibrant online platform for exchanging stock‐related information. Using methods from computational linguistics, we analyse roughly 250,000 stock‐related messages (so‐called tweets) on a daily basis. We find an association between tweet sentiment and stock returns, message volume and trading volume, as well as disagreement and volatility. In contrast to previous related research, we also analyse the mechanism leading to an efficient aggregation of information in microblogging forums. Our results demonstrate that users providing above average investment advice are retweeted (i.e., quoted) more often and have more followers, which amplifies their share of voice. 相似文献
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Cost-Benefit Analysis for the Selection,Migration, and Operation of a Campus Management System 总被引:1,自引:0,他引:1
Jon Sprenger Marc Klages Michael H. Breitner 《Business & Information Systems Engineering》2010,2(4):219-231
An increasing number of students, together with organizational and technological requirements, pose new challenges for universities.
For these reasons, Campus Management Systems provide a solution for the necessary IS-support in student administration. In
order to ensure cost-effectiveness, an extensive cost-utility analysis of the campus management systems under consideration
is required. The process model illustrated here facilitates a ten-step cost-utility analysis for the selection, migration
and operation of a campus management System. The process-oriented approach addresses the challenges posed by cost and benefit
allocation. The subsequent ten steps, using the case analysis of two large German universities, show that the implementation
of an integrated campus management system can lead to significant cost saving effects. The presented process model enables
comparative calculations of differences with regard to the alternatives. The approach enables a comprehensive decision-support
system for the selection of a university-specific and individually applicable campus management system. 相似文献
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Intereconomics - The new EU member candidates, as well as those who have had this status for a decade, present the Union with an opportunity to decide what kind of club it should be. 相似文献
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